| base | (noun) a support or foundation | Synonyms: pedestal, stand |
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| (noun) lowest support of a structure | Synonyms: foot, foundation, fundament, groundwork, substructure, understructure |
| (noun) a place that the runner must touch before scoring | Synonyms: bag |
| (noun) (electronics) the part of a transistor that separates the emitter from the collector | - |
| (noun) installation from which a military force initiates operations | Synonyms: base of operations |
| (noun) a flat bottom on which something is intended to sit | - |
| (noun) the stock of basic facilities and capital equipment needed for the functioning of a country or area | Synonyms: infrastructure |
| (noun) the principal ingredient of a mixture | - |
| (noun) the fundamental assumptions from which something is begun or developed or calculated or explained | Synonyms: basis, cornerstone, foundation, fundament, groundwork |
| (noun) (linguistics) the form of a word after all affixes are removed | Synonyms: radical, root, root word, stem, theme |
| (noun) a lower limit | Synonyms: floor |
| (noun) (anatomy) the part of an organ nearest its point of attachment | - |
| (noun) the place where you are stationed and from which missions start and end | Synonyms: home |
| (noun) the bottom or lowest part | - |
| (noun) (numeration system) the positive integer that is equivalent to one in the next higher counting place | Synonyms: radix |
| (noun) the most important or necessary part of something | Synonyms: basis |
| (noun) the bottom side of a geometric figure from which the altitude can be constructed | - |
| (noun) any of various water-soluble compounds capable of turning litmus blue and reacting with an acid to form a salt and water | Synonyms: alkali |
| (noun) a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA) | Synonyms: nucleotide |
| baseball | (noun) a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs | Synonyms: ball, baseball game |
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| (noun) a ball used in playing baseball | - |
| baseboard | (noun) a molding covering the joint formed by a wall and the floor | Synonyms: mopboard, skirting board |
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| baseline | (noun) the lines a baseball player must follow while running the bases | - |
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| (noun) the back line bounding each end of a tennis or handball court; when serving the server must not step over this line | Synonyms: service line |
| (noun) an imaginary line or standard by which things are measured or compared | - |
| basement | (noun) the lowermost portion of a structure partly or wholly below ground level; often used for storage | Synonyms: cellar |
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| (noun) the ground floor facade or interior in Renaissance architecture | - |
| baseness | (noun) unworthiness by virtue of lacking higher values | Synonyms: contemptibility, despicability, despicableness, sordidness |
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| basenji | (noun) small smooth-haired breed of African origin having a tightly curled tail and the inability to bark | - |
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| basset | (noun) smooth-haired breed of hound with short legs and long ears | Synonyms: basset hound |
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| bathhouse | (noun) a building containing public baths | Synonyms: bagnio |
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| (noun) a building containing dressing rooms for bathers | Synonyms: bathing machine |
| bawdyhouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bordello, brothel, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| bearnaise | (noun) a sauce like hollandaise but made with white wine and tarragon and shallots instead of lemon juice | - |
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| bellicoseness | (noun) a natural disposition to fight | Synonyms: bellicosity |
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| bemusement | (noun) confusion resulting from failure to understand | Synonyms: bafflement, befuddlement, bewilderment, mystification, obfuscation, puzzlement |
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| benniseed | (noun) small oval seeds of the sesame plant | Synonyms: sesame seed |
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| berceuse | (noun) a quiet song intended to lull a child to sleep | Synonyms: cradlesong, lullaby |
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| berserk | (noun) one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury | Synonyms: berserker |
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| berserker | (noun) one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury | Synonyms: berserk |
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| beseechingness | (noun) The state or quality of one who begs or implores. | - |
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| bestseller | (noun) a book that has had a large and rapid sale | Synonyms: best seller |
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| betise | (noun) a stupid mistake | Synonyms: folly, foolishness, imbecility, stupidity |
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| biodefense | (noun) procedures involved in taking defensive measures against attacks using biological agents | Synonyms: biodefence, biological defence, biological defense |
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| birdhouse | (noun) a shelter for birds | - |
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| birdseed | (noun) food given to birds; usually mixed seeds | Synonyms: bird feed, bird food |
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| bise | (noun) a dry cold north wind in southeastern France | Synonyms: bize |
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| bisection | (noun) dividing into two equal parts | - |
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| bisexual | (noun) a person who is sexually attracted to both sexes | Synonyms: bisexual person |
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| bisexuality | (noun) sexual activity with both men and women | - |
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| (noun) showing characteristics of both sexes | Synonyms: androgyny, hermaphroditism |
| blackseed | (noun) grass native to West Indies but common in southern United States having tufted wiry stems often infested with a dark fungus | Synonyms: carpet grass, smut grass, Sporobolus poiretii |
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| bladdernose | (noun) medium-sized blackish-grey seal with large inflatable sac on the head; of Arctic and northern Atlantic waters | Synonyms: Cystophora cristata, hooded seal |
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| blessedness | (noun) a state of supreme happiness | Synonyms: beatification, beatitude |
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| blockhouse | (noun) a stronghold that is reinforced for protection from enemy fire; with apertures for defensive fire | - |
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| blouse | (noun) a top worn by women | - |
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| bluenose | (noun) a native or inhabitant of Nova Scotia | Synonyms: Nova Scotian |
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| boardinghouse | (noun) a private house that provides accommodations and meals for paying guests | Synonyms: boarding house |
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| boathouse | (noun) a shed at the edge of a river or lake; used to store boats | - |
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| boneset | (noun) perennial herb of southeastern United States having white-rayed flower heads; formerly used as in folk medicine | Synonyms: agueweed, Eupatorium perfoliatum, thoroughwort |
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| (noun) European herb having small white, pink or purple flowers; naturalized as a weed in North America | Synonyms: common comfrey, Symphytum officinale |
| bonesetter | (noun) someone (not necessarily a licensed physician) who sets broken bones | - |
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| bookcase | (noun) a piece of furniture with shelves for storing books | - |
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| booklouse | (noun) minute wingless psocopterous insects injurious to books and papers | Synonyms: book louse, deathwatch, Liposcelis divinatorius |
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| bookseller | (noun) the proprietor of a bookstore | - |
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| boothose | (noun) protective stockings worn with or in place of boots | - |
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| bordelaise | (noun) brown sauce with beef marrow and red wine | - |
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| bottlenose | (noun) northern Atlantic beaked whale with a bulbous forehead | Synonyms: bottle-nosed whale, bottlenose whale, Hyperoodon ampullatus |
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| (noun) any of several dolphins with rounded forehead and well-developed beak; chiefly of northern Atlantic and Mediterranean | Synonyms: bottle-nosed dolphin, bottlenose dolphin |
| bouillabaisse | (noun) highly seasoned Mediterranean soup or stew made of several kinds of fish and shellfish with tomatoes and onions or leeks and seasoned with saffron and garlic and herbs | - |
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| bowdleriser | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdlerizer, expurgator |
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| boysenberry | (noun) large raspberry-flavored fruit; cross between blackberries and raspberries | - |
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| (noun) cultivated hybrid bramble of California having large dark wine-red fruit with a flavor resembling raspberries | Synonyms: boysenberry bush |
| braincase | (noun) the part of the skull that encloses the brain | Synonyms: brainpan, cranium |
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| brasserie | (noun) a small restaurant serving beer and wine as well as food; usually cheap | - |
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| breathalyser | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyzer |
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| briefcase | (noun) a case with a handle; for carrying papers or files or books | - |
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| browse | (noun) the act of feeding by continual nibbling | Synonyms: browsing |
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| (noun) reading superficially or at random | Synonyms: browsing |
| (noun) vegetation (such as young shoots, twigs, and leaves) that is suitable for animals to eat | - |
| browser | (noun) a program used to view HTML documents | Synonyms: web browser |
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| (noun) a viewer who looks around casually without seeking anything in particular | - |
| bruise | (noun) an injury that doesn't break the skin but results in some discoloration | Synonyms: contusion |
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| bruiser | (noun) a large and strong and heavyset man | Synonyms: bull, Samson, strapper |
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| bullnose | (noun) a small carpenter's plane with the cutting edge near the front | Synonyms: bullnosed plane |
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| bunsen | (noun) a gas burner used in laboratories; has an air valve to regulate the mixture of gas and air | Synonyms: bunsen burner, etna |
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| burnoose | (noun) a long hooded cloak woven of wool in one piece; worn by Arabs and Moors | Synonyms: burnous, burnouse |
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| burnouse | (noun) a long hooded cloak woven of wool in one piece; worn by Arabs and Moors | Synonyms: burnoose, burnous |
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| cabasset | (noun) a metal helmet worn by common soldiers in the 16th century | Synonyms: morion |
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| caboose | (noun) a car on a freight train for use of the train crew; usually the last car on the train | Synonyms: cabin car |
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| (noun) the area for food preparation on a ship | Synonyms: cookhouse, galley, ship's galley |
| callosectomy | (noun) severing the corpus callosum so that communication between the cerebral hemispheres is interrupted (in cases of severe intractable epilepsy) | Synonyms: callosotomy |
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| camise | (noun) a loose shirt or tunic; originally worn in the Middle Ages | - |
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| canvasser | (noun) someone who conducts surveys of public opinion | Synonyms: headcounter, poll taker, pollster |
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| (noun) someone who examines votes at an election | Synonyms: scrutineer |
| (noun) a petitioner who solicits contributions or trade or votes | Synonyms: solicitor |
| (noun) a person who takes or counts votes | - |
| caravanserai | (noun) an inn in some eastern countries with a large courtyard that provides accommodation for caravans | Synonyms: caravan inn, caravansary, khan |
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| carcase | (noun) the dead body of an animal especially one slaughtered and dressed for food | Synonyms: carcass |
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| cardcase | (noun) a small case for carrying business cards | - |
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| cardhouse | (noun) an unstable construction with playing cards | Synonyms: card-house, cardcastle, house of cards |
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| carouse | (noun) revelry in drinking; a merry drinking party | Synonyms: bender, booze-up, carousal, toot |
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| carousel | (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carrousel, merry-go-round, roundabout, whirligig |
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| (noun) a conveyer belt that carries luggage to be claimed by air travelers | Synonyms: carrousel, luggage carousel, luggage carrousel |
| carouser | (noun) someone who enjoys riotous drinking | Synonyms: wassailer |
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| carrousel | (noun) a large, rotating machine with seats for children to ride on for amusement | Synonyms: carousel, merry-go-round, roundabout, whirligig |
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| (noun) a conveyer belt that carries luggage to be claimed by air travelers | Synonyms: carousel, luggage carousel, luggage carrousel |
| carthorse | (noun) draft horse kept for pulling carts | Synonyms: cart horse, drayhorse |
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| case | (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: causa, cause, lawsuit, suit |
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| (noun) a portable container for carrying several objects | - |
| (noun) a glass container used to store and display items in a shop or museum or home | Synonyms: display case, showcase, vitrine |
| (noun) bed linen consisting of a cover for a pillow | Synonyms: pillow slip, pillowcase, slip |
| (noun) (printing) the receptacle in which a compositor has his type, which is divided into compartments for the different letters, spaces, or numbers | Synonyms: compositor's case, typesetter's case |
| (noun) the housing or outer covering of something | Synonyms: casing, shell |
| (noun) the enclosing frame around a door or window opening | Synonyms: casing |
| (noun) an enveloping structure or covering enclosing an animal or plant organ or part | Synonyms: sheath |
| (noun) the actual state of things | - |
| (noun) nouns or pronouns or adjectives (often marked by inflection) related in some way to other words in a sentence | Synonyms: grammatical case |
| (noun) a statement of facts and reasons used to support an argument | - |
| (noun) a problem requiring investigation | - |
| (noun) a specific size and style of type within a type family | Synonyms: face, font, fount, typeface |
| (noun) an occurrence of something | Synonyms: example, instance |
| (noun) a person who is subjected to experimental or other observational procedures; someone who is an object of investigation | Synonyms: guinea pig, subject |
| (noun) a person requiring professional services | - |
| (noun) a person of a specified kind (usually with many eccentricities) | Synonyms: character, eccentric, type |
| (noun) the quantity contained in a case | Synonyms: caseful |
| (noun) a special set of circumstances | Synonyms: event |
| (noun) a specific state of mind that is temporary | - |
| casebook | (noun) a book in which detailed written records of a case are kept and which are a source of information for subsequent work | - |
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| caseful | (noun) the quantity contained in a case | Synonyms: case |
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| casein | (noun) a water-base paint made with a protein precipitated from milk | Synonyms: casein paint |
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| (noun) a milk protein used in making e.g. plastics and adhesives | - |
| casement | (noun) a window sash that is hinged (usually on one side) | - |
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| casern | (noun) military barracks in a garrison town | - |
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| casework | (noun) close sociological study of a maladjusted person or family for diagnosis and treatment | - |
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| caseworker | (noun) someone employed to provide social services (especially to the disadvantaged) | Synonyms: social worker, welfare worker |
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| caseworm | (noun) insect larva that constructs a protective case around its body | - |
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| caspase | (noun) any of a group of proteases that mediate apoptosis | - |
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| casserole | (noun) large deep dish in which food can be cooked and served | - |
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| (noun) food cooked and served in a casserole | - |
| cassette | (noun) a container that holds a magnetic tape used for recording or playing sound or video | - |
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| catalase | (noun) enzyme found in most plant and animal cells that functions as an oxidative catalyst; decomposes hydrogen peroxide into oxygen and water | - |
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| catchphrase | (noun) a phrase that has become a catchword | Synonyms: catch phrase |
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| cathouse | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, brothel, house of ill repute, house of prostitution, sporting house, whorehouse |
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| cause | (noun) any entity that produces an effect or is responsible for events or results | Synonyms: causal agency, causal agent |
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| (noun) a comprehensive term for any proceeding in a court of law whereby an individual seeks a legal remedy | Synonyms: case, causa, lawsuit, suit |
| (noun) a series of actions advancing a principle or tending toward a particular end | Synonyms: campaign, crusade, drive, effort, movement |
| (noun) a justification for something existing or happening | Synonyms: grounds, reason |
| (noun) events that provide the generative force that is the origin of something | - |
| causerie | (noun) light informal conversation for social occasions | Synonyms: chin-wag, chin-wagging, chin wag, chin wagging, chit-chat, chit chat, chitchat, gab, gabfest, gossip, small talk, tittle-tattle |
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| causeway | (noun) a road that is raised above water or marshland or sand | - |
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| cayuse | (noun) a small native range horse | Synonyms: Indian pony |
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| cease | (noun) (`cease' is a noun only in the phrase `without cease') end | - |
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| ceaselessness | (noun) the quality of something that continues without end or interruption | Synonyms: continuousness, incessancy, incessantness |
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| cellulose | (noun) a polysaccharide that is the chief constituent of all plant tissues and fibers | - |
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| censer | (noun) a container for burning incense (especially one that is swung on a chain in a religious ritual) | Synonyms: thurible |
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| cerise | (noun) a red the color of ripe cherries | Synonyms: cherry, cherry red |
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| ceruse | (noun) a poisonous white pigment that contains lead | Synonyms: lead carbonate, white lead |
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| chaise | (noun) a carriage consisting of two wheels and a calash top; drawn by a single horse | Synonyms: shay |
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| (noun) a long chair; for reclining | Synonyms: chaise longue, daybed |
| chapterhouse | (noun) a house used as a residence by a chapter of a fraternity | Synonyms: frat house, fraternity house |
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| (noun) a building attached to a monastery or cathedral; used as a meeting place for the chapter | - |
| charterhouse | (noun) a Carthusian monastery | - |
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