Here is a comprehensive list of over 150 words that end in letter x.

• Affix (to attach or append something)
• Aftertax (relating to the amount of money after taxes have been deducted)
• Annex (to add as an extra or subordinate part, especially to a document)
• Antapex – The point in the sky directly opposite the solar apex; the direction in which the solar system is moving away from.
• Apex (the top or highest part of something)
• Bandbox (a lightweight hat box or a small, neat, and attractive place)
• Banjax (to ruin or destroy)
• Beeswax (a natural wax produced by honey bees)
• Bollix (to mess up or bungle)
• Borax (a boron compound used as a flux in welding, as a mild antiseptic, and in laundry detergents)
• Box (a container with a flat base and sides, typically square or rectangular and having a lid)
• Biobox – A container used for biological samples or experiments under controlled conditions.
• Breadbox (a container for keeping bread fresh)
• Calyx (the sepals of a flower, typically forming a whorl that encloses the petals and forms a protective layer around a flower in bud)
• Cashbox (a box or small chest for holding cash)
• Caudex (the thickened stem or trunk of a plant, often found in succulents and ferns)
• Cervix (the narrow passage forming the lower end of the uterus)
• Cineplex (a cinema complex with multiple screens)
• Circumflex (a diacritical mark (^) used to indicate the alteration of a vowel sound)
• Climax (the most intense, exciting, or important point of something; a culmination)
• Codex (an ancient manuscript text in book form)
• Complex (consisting of many different and connected parts)
• Cortex (the outer layer of an organ or structure, especially the brain)
• Cox (short for coxswain, the person who steers and directs a rowing crew)
• Cybersex (sexual activity or arousal through electronic communication)
• Desex (to remove the sexual organs of; to neuter or spay)
• Detox (the process of removing toxic substances or qualities)
• Duplex (a house divided into two apartments, or communication in both directions simultaneously)
• Efflux (the flowing out of a particular substance or particle)
• Endocervix (the inner part of the cervix, the opening to the uterus)
• Endotox (short for endotoxin, a toxin present inside a bacterial cell that is released when the cell disintegrates)
• Epicalyx (a group of bracts resembling a calyx but situated above it, as in some flower species)
• Equinox (the time or date at which the sun crosses the celestial equator, when day and night are of equal length)
• Ethox ([Possibly referring to ethoxylation, a chemical process])
• Ex (former; of earlier time)
• Exotox (short for exotoxin, a toxin released by bacteria into the surrounding environment)
• Fairfax ([A surname or place name, no specific definition])
• Fax (short for facsimile, a system for transmitting copies of documents using telephone lines)
• Felix ([A name, often associated with happiness or luck from Latin origin])
• Firebox (the chamber of a boiler or furnace where fuel is burned)
• Fix (to repair or stabilize something)
• Flummox (to perplex or bewilder someone)
• Flux (continuous change or movement, or in physics, the rate of flow of a fluid, radiant energy, or particles across a given area)
• Galax (a genus of evergreen herbaceous plants in the family Diapensiaceae)
• Galaxy (a large system of stars, gas, and dust bound together by gravitational forces)
• Gearbox (a mechanical device with a set of gears used to transmit torque and change the speed of a vehicle)
• Grex (in horticulture, a collective term for the offspring of a specific cross or breeding)
• Hapax (short for hapax legomenon, a word or expression that appears only once within a context or body of work)
• Hatbox (a container or case for storing and transporting hats)
• Helix (a type of smooth space curve, like the shape of a spring or spiral)
• Hellbox (a receptacle in a printing office, for holding discarded type)
• Hoax (a malicious deception)
• Homodox – Pertaining to having the same opinions or beliefs (less commonly used).
• Hydrox ([Originally a brand name for cream-filled chocolate sandwich cookies, predating Oreo])
• Ibex (a type of wild mountain goat with large, backward-curving horns)
• Icebox (an insulated cabinet or chest for storing ice and keeping food cold)
• Inbox (a place or folder where incoming messages or emails are received)
• Index (an alphabetical list of names, subjects, etc., with references to the places where they occur, typically found at the end of a book)
• Influx – An arrival or entry of large numbers of people or things.
• Intersex (pertaining to a person or animal with physical sex characteristics that do not fit typical binary notions of male or female bodies)
• Jambeaux (pieces of plate armor for the leg, covering the shin from the knee to the ankle)
• Jinx (a person or thing that brings bad luck)
• Jukebox (a machine that automatically plays a selected musical recording when a coin is inserted)
• Juicebox – A small container for holding and dispensing juice, often used in packed lunches or for snacks.
• Jynx (a genus of birds, also spelled as “jinx” which means to bring bad luck)
• Kex (a dry, hollow stalk, especially of a cow parsley or similar plant)
• Keybox (a secure container for storing keys)
• Kickbox (a form of martial art or sport that combines boxing punches and martial arts kicks)
• Kinepox ([Historic term for cowpox, used in early vaccines against smallpox])
• Kleenex (a brand name, often used generically for facial tissue)
• Knickknax ([Alternate spelling of “knickknacks,” small decorative ornaments or trinkets])
• Larynx (the hollow muscular organ forming an air passage to the lungs and holding the vocal cords; the voice box)
• Lightbox (a container with a light inside used for viewing transparencies or for photographic tracing)
• Lockbox (a secure container for storing valuables, keys, or documents)
• Lox (smoked salmon)
• Lummox (a clumsy, stupid person)
• Lunchbox – A container used to store and transport food for personal meal consumption.
• Lux (a unit of illuminance, measuring luminous flux per unit area)
• Lynx (a wild cat with yellowish-brown fur, a short tail, and tufts of black hair on the tips of its ears)
• Mailbox (a box into which mail is delivered, especially one outside a residence or attached to a street post for outgoing mail)
• Matchbox (a small box containing matches)
• Matrix (an environment or material in which something develops; a surrounding medium or structure)
• Max (short for maximum, the highest amount, value, or degree)
• Minx (a flirtatious or impudent young woman)
• Mirex (a chlorinated hydrocarbon insecticide)
• Multiplex (a system that combines multiple signals into one or a cinema with multiple screens)
• Murex – A type of sea snail, historically important for producing purple dye.
• Neocortex (the part of the brain involved in higher-order brain functions such as sensory perception, cognition, and generation of motor commands)
• Neurotox (short for neurotoxin, a toxin that affects neural tissues)
• Nix (nothing, or to cancel or veto something)
• Nutrix (a nourishing substance, or in historical context, a nurse or caretaker)
• Orthodox – Adhering to the accepted or traditional and established faith, especially in religion.
• Orthoprax (correct practice or action, especially in religious context)
• Outbox (a box or tray for outgoing mail or messages)
• Outflux (the flow or streaming outward of something)
• Outfox (to defeat or deceive by being more clever or cunning)
• Overcomplex (unnecessarily or excessively complex)
• Ox (a domesticated bovine animal kept for milk or meat; plural oxen)
• Panchax (a type of small tropical fish)
• Paradox (a statement or proposition that, despite sound reasoning from acceptable premises, leads to a conclusion that seems senseless, logically unacceptable, or self-contradictory)
• Perplex (to cause someone to feel confused or bewildered)
• Phalanx – A body of troops or police officers standing or moving in close formation.
• Phoenix (a mythical bird that is said to regenerate, arising from the ashes of its predecessor)
• Pillbox (a small box for holding pills; or a small, low, concrete fortification used in warfare)
• Plex (short for complex or multiplex; used as a suffix to denote a number of parts or units)
• Prefix – A word, letter, or number placed before another.
• Quadplex (a building divided into four separate residences or apartments)
• Quickfix (a fast and easy solution, often temporary)
• Quincunx (an arrangement of five objects with four at the corners of a square and one at the center)
• Redux (brought back; revived)
• Reflex (an involuntary response to a stimulus)
• Relax (make or become less tense or anxious)
• Remix (a piece of media which has been altered from its original state by adding, removing, and/or changing pieces of the item)
• Retroflex (curled or bent backwards; in linguistics, a type of consonantal sound used in some languages)
• Saltbox (a style of house with a long, pitched roof that slopes down to the back)
• Sandbox (a shallow box filled with sand for children to play in; or a testing environment for software development)
• Sardonyx (a variety of onyx with alternating layers of sard and onyx, used as a gemstone)
• Seedbox (a high-bandwidth remote server for uploading and downloading digital files)
• Silex (flint or quartz, used historically for sparking fire or in the manufacture of glass and ceramics)
• Silox ([Possibly related to silicones, specifically polysiloxanes, a type of synthetic polymer])
• Smallpox (a serious, contagious, and sometimes fatal infectious disease caused by the variola virus)
• Spadix (a type of flower spike with a fleshy axis, found in plants such as the peace lily and philodendron)
• Sphinx (a mythical creature with the head of a human and the body of a lion, known from Egyptian and Greek mythology)
• Subindex (a secondary index or an index within a larger index)
• Supramax (a category of bulk carrier vessels, larger than handymax and smaller than panamax)
• Syntax (the arrangement of words and phrases to create well-formed sentences in a language)
• Tax (a compulsory contribution to state revenue, levied by the government on workers’ income and business profits or added to the cost of some goods, services, and transactions)
• Teabox (a box for storing tea leaves or tea bags)
• Tex (a unit of measure for the linear mass density of fibers, defined as the mass in grams per 1000 meters)
• Thorax (the part of the body between the neck and the abdomen, enclosed by the ribs and containing the heart and lungs)
• Tinderbox – A box containing tinder, flint, and a steel for lighting fires, or a place or situation that could easily become dangerous or violent.
• Toolbox (a box or container for storing tools)
• Transfix – To cause (someone) to become motionless with horror, wonder, or astonishment.
• Triplex (a building divided into three separate residences or apartments; or relating to a system of transmitting three signals simultaneously)
• Unbox (to remove from a box or packaging)
• Unisex (designed for or suitable for both sexes)
• Unix (a family of multitasking, multiuser computer operating systems)
• Unorthodox (contrary to what is usual, traditional, or accepted)
• Varix (an enlarged, swollen, or knotty vein)
• Vertex (the highest point; the top or apex)
• Vex (to make someone feel annoyed, frustrated, or worried, especially with trivial matters)
• Voicebox (another term for the larynx, which houses the vocal cords)
• Vortex (a whirling mass of fluid or air, especially a whirlpool or whirlwind)
• Watchbox (a box used to store watches)
• Wax (a sticky yellowish moldable substance secreted by honeybees as the material of honeycomb; or to increase in size, numbers, strength, prosperity, or intensity)
• Woodwax ([Possibly referring to dyer’s greenweed, used historically for dyeing])
• Workbox (a box for holding sewing or craft supplies)
• Xerox (a brand name used generically for photocopying)
• Yellowbox (a type of Eucalyptus tree known for its durable timber)
• Yex ([Historic or dialect term for a hiccup or belch])
• Zax (a tool for cutting roof slates)