| black | (adjective) being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light | - |
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| (adjective) of or belonging to a racial group especially of sub-Saharan African origin | - |
| (adjective) marked by anger or resentment or hostility | - |
| (adjective) (of the face) made black especially as with suffused blood | Synonyms: blackened |
| (adjective) (of intelligence operations) deliberately misleading | - |
| (adjective) extremely dark | Synonyms: pitch-black, pitch-dark |
| (adjective) soiled with dirt or soot | Synonyms: smutty |
| (adjective) (used of conduct or character) deserving or bringing disgrace or shame | Synonyms: disgraceful, ignominious, inglorious, opprobrious, shameful |
| (adjective) stemming from evil characteristics or forces; wicked or dishonorable | Synonyms: dark, sinister |
| (adjective) offering little or no hope | Synonyms: bleak, dim |
| (adjective) distributed or sold illicitly | Synonyms: black-market, bootleg, contraband, smuggled |
| (adjective) harshly ironic or sinister | Synonyms: grim, mordant |
| (adjective) (of coffee) without cream or sugar | - |
| (adjective) (of events) having extremely unfortunate or dire consequences; bringing ruin | Synonyms: calamitous, disastrous, fatal, fateful |
| (noun) black clothing (worn as a sign of mourning) | - |
| (noun) (board games) the darker pieces | - |
| (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: blackness, inkiness |
| (noun) total absence of light | Synonyms: blackness, lightlessness, pitch blackness, total darkness |
| (verb) make or become black | Synonyms: blacken, melanise, melanize |
| blackamoor | (noun) a person with dark skin who comes from Africa (or whose ancestors came from Africa) | Synonyms: Black person |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| (verb) expel from a community or group | Synonyms: ban, banish, cast out, ostracise, ostracize, shun |
| (verb) vote against; refuse to endorse; refuse to assent | Synonyms: negative, veto |
| blackbeetle | (noun) dark brown cockroach originally from orient now nearly cosmopolitan in distribution | Synonyms: Asiatic cockroach, Blatta orientalis, oriental cockroach, oriental roach |
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| blackberry | (noun) large sweet black or very dark purple edible aggregate fruit of any of various bushes of the genus Rubus | - |
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| (noun) bramble with sweet edible black or dark purple berries that usually do not separate from the receptacle | Synonyms: blackberry bush |
| (verb) pick or gather blackberries | - |
| blackbird | (noun) any bird of the family Icteridae whose male is black or predominantly black | Synonyms: New World blackbird |
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| (noun) common black European thrush | Synonyms: European blackbird, merl, merle, ousel, ouzel, Turdus merula |
| blackboard | (noun) sheet of slate; for writing with chalk | Synonyms: chalkboard |
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| blackbody | (noun) a hypothetical object capable of absorbing all the electromagnetic radiation falling on it | Synonyms: black body, full radiator |
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| blackbuck | (noun) common Indian antelope with a dark back and spiral horns | Synonyms: Antilope cervicapra, black buck |
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| blackcap | (noun) small brownish-grey warbler with a black crown | Synonyms: Silvia atricapilla |
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| (noun) chickadee having a dark crown | Synonyms: black-capped chickadee, Parus atricapillus |
| (noun) small black-headed European gull | Synonyms: Larus ridibundus, laughing gull, pewit, pewit gull |
| (noun) raspberry native to eastern North America having black thimble-shaped fruit | Synonyms: black raspberry, blackcap raspberry, Rubus occidentalis, thimbleberry |
| blackcock | (noun) male black grouse | Synonyms: black cock |
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| blackdamp | (noun) the atmosphere in a mine following an explosion; high in carbon dioxide and incapable of supporting life | Synonyms: chokedamp |
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| blacken | (verb) make or become black | Synonyms: black, melanise, melanize |
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| (verb) burn slightly and superficially so as to affect color | Synonyms: char, scorch, sear |
| blackened | (adjective) (of the face) made black especially as with suffused blood | Synonyms: black |
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| (adjective) darkened by smoke | - |
| blackening | (noun) changing to a darker color | Synonyms: darkening |
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| blackface | (noun) the makeup (usually burnt cork) used by a performer in order to imitate a Negro | - |
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| blackfish | (noun) female salmon that has recently spawned | - |
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| (noun) small dark-colored whale of the Atlantic coast of the United States; the largest male acts as pilot or leader for the school | Synonyms: black whale, common blackfish, Globicephala melaena, pilot whale |
| (noun) large dark-colored food fish of the Atlantic coast of North America | Synonyms: tautog, Tautoga onitis |
| blackfly | (noun) small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals | Synonyms: black fly, buffalo gnat |
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| (noun) blackish aphid that infests e.g. beans and sugar beets | Synonyms: Aphis fabae, bean aphid |
| blackguard | (noun) someone who is morally reprehensible | Synonyms: bounder, cad, dog, heel, hound |
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| (verb) use foul or abusive language towards | Synonyms: abuse, clapperclaw, shout |
| (verb) subject to laughter or ridicule | Synonyms: guy, jest at, laugh at, make fun, poke fun, rib, ridicule, roast |
| blackguardly | (adjective) lacking principles or scruples | Synonyms: rascally, roguish, scoundrelly |
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| 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 | - |
| blacking | (noun) a substance used to produce a shiny protective surface on footwear | Synonyms: shoe polish |
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| blackish | (adjective) of something that is somewhat black | - |
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| blackjack | (noun) a gambling game using cards; the object is to hold cards having a higher count than those dealt to the banker up to but not exceeding 21 | Synonyms: twenty-one, vingt-et-un |
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| (noun) a piece of metal covered by leather with a flexible handle; used for hitting people | Synonyms: cosh, sap |
| (noun) a flag usually bearing a white skull and crossbones on a black background; indicates a pirate ship | Synonyms: black flag, Jolly Roger, pirate flag |
| (noun) a common scrubby deciduous tree of central and southeastern United States having dark bark and broad three-lobed (club-shaped) leaves; tends to form dense thickets | Synonyms: blackjack oak, jack oak, Quercus marilandica |
| (verb) exert pressure on someone through threats | Synonyms: blackmail, pressure |
| blacklead | (verb) cover with graphite | - |
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| blackleg | (noun) someone who works (or provides workers) during a strike | Synonyms: rat, scab, strikebreaker |
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| (verb) take the place of work of someone on strike | Synonyms: fink, rat, scab |
| blacklist | (noun) a list of people who are out of favor | Synonyms: black book, shitlist |
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| (verb) put on a blacklist so as to banish or cause to be boycotted | - |
| blackmail | (noun) extortion of money by threats to divulge discrediting information | - |
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| (verb) obtain through threats | - |
| (verb) exert pressure on someone through threats | Synonyms: blackjack, pressure |
| blackmailer | (noun) a criminal who extorts money from someone by threatening to expose embarrassing information about them | Synonyms: extortioner, extortionist |
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| blackness | (noun) the quality or state of the achromatic color of least lightness (bearing the least resemblance to white) | Synonyms: black, inkiness |
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| (noun) total absence of light | Synonyms: black, lightlessness, pitch blackness, total darkness |
| blackout | (noun) a momentary loss of consciousness | - |
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| (noun) partial or total loss of memory | Synonyms: amnesia, memory loss |
| (noun) the failure of electric power for a general region | - |
| (noun) darkness resulting from the extinction of lights (as in a city invisible to enemy aircraft) | Synonyms: brownout, dimout |
| (noun) a suspension of radio or tv broadcasting | - |
| blackpoll | (noun) North American warbler having a black-and-white head | Synonyms: Dendroica striate |
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| 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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| blacksmith | (noun) a smith who forges and shapes iron with a hammer and anvil | - |
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| blacksnake | (noun) blackish racer of the eastern United States that grows to six feet | Synonyms: black racer, Coluber constrictor |
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| (noun) large harmless shiny black North American snake | Synonyms: black rat snake, Elaphe obsoleta, mountain blacksnake, pilot blacksnake |
| blacktail | (noun) mule deer of western Rocky Mountains | Synonyms: black-tailed deer, blacktail deer, Odocoileus hemionus columbianus |
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| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| blacktop | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktopping |
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| (verb) coat with blacktop | - |
| blacktopping | (noun) a black bituminous material used for paving roads or other areas; usually spread over crushed rock | Synonyms: blacktop |
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| blackwash | (noun) a wash that colors a surface black | - |
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| (noun) a mixture of calomel and limewater that is used on syphilitic sores | Synonyms: black lotion |
| (noun) an attack intended to ruin someone's reputation | Synonyms: assassination, character assassination |
| (verb) color with blackwash | - |
| (verb) bring (information) out of concealment | - |
| blackwater | (noun) any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells | - |
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| blackwood | (noun) any of several hardwood trees yielding very dark-colored wood | Synonyms: blackwood tree |
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| (noun) very dark wood of any of several blackwood trees | - |