| authentic | (adjective) not counterfeit or copied | Synonyms: bona fide, unquestionable, veritable |
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| (adjective) conforming to fact and therefore worthy of belief | Synonyms: reliable |
| authentically | (adverb) genuinely; with authority | Synonyms: genuinely |
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| authenticate | (verb) establish the authenticity of something | - |
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| authenticated | (adjective) established as genuine | Synonyms: attested, documented |
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| authentication | (noun) validating the authenticity of something or someone | Synonyms: certification |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, hallmark |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| authenticity | (noun) undisputed credibility | Synonyms: genuineness, legitimacy |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autographed | (adjective) bearing an autograph | - |
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| avalanche | (noun) a slide of large masses of snow and ice and mud down a mountain | - |
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| (noun) a sudden appearance of an overwhelming number of things | - |
| (verb) gather into a huge mass and roll down a mountain, of snow | Synonyms: roll down |
| awheel | (adjective) traveling by wheeled vehicle such as bicycle or automobile e.g. | - |
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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| (verb) lead a bachelor's existence | Synonyms: bach |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| backache | (noun) an ache localized in the back | - |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| backsheesh | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: baksheesh, bakshis, bakshish, gratuity, pourboire, tip |
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| baksheesh | (noun) a relatively small amount of money given for services rendered (as by a waiter) | Synonyms: backsheesh, bakshis, bakshish, gratuity, pourboire, tip |
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| baldhead | (noun) a person whose head is bald or shaved | Synonyms: baldpate, baldy, skin, skinhead |
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| banshee | (noun) (Irish folklore) a female spirit who wails to warn of impending death | Synonyms: banshie |
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| bareheaded | (adjective) having the head uncovered | Synonyms: bared |
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| barouche | (noun) a horse-drawn carriage having four wheels; has an outside seat for the driver and facing inside seats for two couples and a folding top | - |
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| basidiolichen | (noun) a lichen in which the fungus component is a basidiomycete | - |
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| bathe | (noun) the act of swimming for pleasure or recreation | - |
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| (verb) cleanse the entire body | - |
| (verb) suffuse or envelope with something | - |
| (verb) swim for pleasure or recreation | - |
| bather | (noun) a person who travels through the water by swimming | Synonyms: natator, swimmer |
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| (noun) a person who takes a bath | - |
| bathetic | (adjective) effusively or insincerely emotional | Synonyms: drippy, hokey, kitschy, maudlin, mawkish, mushy, sappy, schmaltzy, schmalzy, sentimental, slushy, soppy, soupy |
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| bathyscaphe | (noun) navigable deep diving vessel for underwater exploration | Synonyms: bathyscape, bathyscaph |
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| bathysphere | (noun) spherical deep diving apparatus (lowered by a cable) for underwater exploration | - |
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| beachhead | (noun) an initial accomplishment that opens the way for further developments | Synonyms: foothold |
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| (noun) a bridgehead on the enemy's shoreline seized by an amphibious operation | - |
| bedclothes | (noun) coverings that are used on a bed | Synonyms: bed clothing, bedding |
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| beechen | (adjective) consisting of or made of wood of the beech tree | - |
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| behead | (verb) cut the head of | Synonyms: decapitate, decollate |
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| beheaded | (adjective) having had the head cut off | Synonyms: decapitated |
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| beheading | (noun) killing by cutting off the head | Synonyms: decapitation |
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| (noun) execution by cutting off the victim's head | Synonyms: decapitation |
| behemoth | (noun) someone that is abnormally large and powerful | Synonyms: colossus, giant, goliath, monster |
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| (noun) a person of exceptional importance and reputation | Synonyms: colossus, giant, heavyweight, titan |
| behest | (noun) an authoritative command or request | - |
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| bellwether | (noun) sheep that leads the herd often wearing a bell | - |
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| (noun) someone who assumes leadership of a movement or activity | - |
| bellyache | (noun) an ache localized in the stomach or abdominal region | Synonyms: gastralgia, stomach ache, stomachache |
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| (verb) complain | Synonyms: beef, bitch, crab, gripe, grouse, holler, squawk |
| bellyacher | (noun) a person given to excessive complaints and crying and whining | Synonyms: complainer, crybaby, grumbler, moaner, sniveller, squawker, whiner |
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| bethel | (noun) a house of worship (especially one for sailors) | - |
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| betrothed | (adjective) pledged to be married | Synonyms: bespoken, engaged |
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| (noun) the person to whom you are engaged | - |
| bewitched | (adjective) captured, as if under a spell | Synonyms: ensorcelled |
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| bewitchery | (noun) magnetic personal charm | Synonyms: animal magnetism, beguilement |
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| bibliographer | (noun) someone trained in compiling bibliographies | - |
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| bibliothec | (noun) a professional person trained in library science and engaged in library services | Synonyms: librarian |
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| bibliotheca | (noun) a collection of books | - |
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| bibliothecal | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecarial |
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| bibliothecarial | (adjective) of or relating to a library or bibliotheca or a librarian | Synonyms: bibliothecal |
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| bighead | (noun) any of various diseases of animals characterized by edema of the head and neck | - |
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| bigheaded | (adjective) (used colloquially) overly conceited or arrogant | Synonyms: persnickety, snooty, snot-nosed, snotty, stuck-up, too big for one's breeches, uppish |
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| bighearted | (adjective) given or giving freely | Synonyms: big, bounteous, bountiful, freehanded, giving, handsome, liberal, openhanded |
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| bigheartedness | (noun) the quality of being kind and generous | - |
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| bigmouthed | (adjective) unwisely talking too much | Synonyms: blabbermouthed, blabby, talkative |
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| bimorphemic | (adjective) consisting of two morphemes | - |
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| biochemical | (adjective) of or relating to biochemistry; involving chemical processes in living organisms | - |
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| biochemically | (adverb) with respect to biochemistry | - |
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| biochemist | (noun) someone with special training in biochemistry | - |
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| biochemistry | (noun) the organic chemistry of compounds and processes occurring in organisms; the effort to understand biology within the context of chemistry | - |
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| biographer | (noun) someone who writes an account of a person's life | - |
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| biosphere | (noun) the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist | - |
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| biosynthesis | (noun) production of a chemical compound by a living organism | Synonyms: biogenesis |
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| biosynthetic | (adjective) of or relating to biosynthesis | - |
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| birchen | (adjective) consisting of or made of wood of the birch tree | Synonyms: birch, birken |
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| bitchery | (noun) aggressive remarks and behavior like that of a spiteful malicious woman | - |
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| bitthead | (noun) the upper end of a bitt | - |
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| blabbermouthed | (adjective) prone to communicate confidential information | Synonyms: leaky, talebearing, tattling |
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| (adjective) unwisely talking too much | Synonyms: bigmouthed, blabby, talkative |
| blackhead | (noun) a black-tipped plug clogging a pore of the skin | Synonyms: comedo |
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| blackheart | (noun) heart cherry with dark flesh and skin | Synonyms: blackheart cherry |
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| (noun) any of various diseases in which the central tissues blacken | - |
| blanched | (adjective) anemic looking from illness or emotion | Synonyms: ashen, bloodless, livid, white |
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| (adjective) (especially of plants) developed without chlorophyll by being deprived of light | Synonyms: etiolate, etiolated |
| blaspheme | (verb) utter obscenities or profanities | Synonyms: curse, cuss, imprecate, swear |
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| (verb) speak of in an irreverent or impious manner | - |
| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| blasphemous | (adjective) characterized by profanity or cursing | Synonyms: blue, profane |
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| (adjective) grossly irreverent toward what is held to be sacred | Synonyms: profane, sacrilegious |
| blasphemously | (adverb) in a blasphemous manner | - |
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| blasphemy | (noun) blasphemous behavior; the act of depriving something of its sacred character | Synonyms: desecration, profanation, sacrilege |
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| (noun) blasphemous language (expressing disrespect for God or for something sacred) | - |
| blastosphere | (noun) early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs | Synonyms: blastula |
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| blastospheric | (adjective) of or relating to a blastula | Synonyms: blastular |
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| blather | (noun) foolish gibberish | Synonyms: blatherskite |
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| (verb) to talk foolishly | Synonyms: babble, blether, blither, smatter |
| blatherskite | (noun) foolish gibberish | Synonyms: blather |
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| bleached | (adjective) (used of color) artificially produced; not natural | Synonyms: colored, coloured, dyed |
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| (adjective) having lost freshness or brilliance of color | Synonyms: faded, washed-out, washy |
| bleacher | (noun) a worker who bleaches (cloth or flour etc.) | - |
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| bleachers | (noun) (used in the plural) an outdoor grandstand without a roof; patrons are exposed to the sun as linens are when they are bleached | - |
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| blemished | (adjective) marred by imperfections | - |
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| (adjective) having a blemish or flaw | Synonyms: flawed |
| blether | (noun) idle or foolish and irrelevant talk | Synonyms: chin music, idle talk, prate, prattle |
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| (verb) to talk foolishly | Synonyms: babble, blather, blither, smatter |
| blithe | (adjective) carefree and happy and lighthearted | Synonyms: blithesome, light-hearted, lighthearted, lightsome |
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| (adjective) lacking or showing a lack of due concern | - |
| blithely | (adverb) in a joyous manner | Synonyms: gayly, happily, jubilantly, merrily, mirthfully |
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| blitheness | (noun) a feeling of spontaneous good spirits | Synonyms: cheerfulness |
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| blither | (verb) to talk foolishly | Synonyms: babble, blather, blether, smatter |
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| blithesome | (adjective) carefree and happy and lighthearted | Synonyms: blithe, light-hearted, lighthearted, lightsome |
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| blockhead | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: bonehead, dumbass, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| blockheaded | (adjective) (used informally) stupid | Synonyms: boneheaded, duncical, duncish, fatheaded, loggerheaded, thick-skulled, thick, thickheaded, wooden-headed |
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| bloodshed | (noun) indiscriminate slaughter | Synonyms: battue, bloodbath, bloodletting |
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| (noun) the shedding of blood resulting in murder | Synonyms: gore |
| blotched | (adjective) marked with irregularly shaped spots or blots | Synonyms: blotchy, splotched |
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| blucher | (noun) a high shoe with laces over the tongue | - |
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| bluehead | (noun) small Atlantic wrasse the male of which has a brilliant blue head | Synonyms: Thalassoma bifasciatum |
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| blusher | (noun) makeup consisting of a pink or red powder applied to the cheeks | Synonyms: blush, paint, rouge |
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| (noun) yellowish edible agaric that usually turns red when touched | Synonyms: Amanita rubescens, blushing mushroom |
| bohemia | (noun) a group of artists and writers with real or pretended artistic or intellectual aspirations and usually an unconventional life style | - |
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| bohemian | (adjective) unconventional in especially appearance and behavior | - |
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| (noun) a nonconformist writer or artist who lives an unconventional life | - |
| bohemianism | (noun) conduct characteristic of a bohemian | - |
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| bolshevise | (verb) make Communist or bring in accord with Communist principles | Synonyms: bolshevize, communise, communize |
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