| ability | (noun) the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment | - |
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| (noun) possession of the qualities (especially mental qualities) required to do something or get something done | Synonyms: power |
| acceptability | (noun) satisfactoriness by virtue of conforming to approved standards | Synonyms: acceptableness |
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| accessibility | (noun) the quality of being at hand when needed | Synonyms: availability, availableness, handiness |
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| (noun) the attribute of being easy to meet or deal with | Synonyms: approachability |
| accountability | (noun) responsibility to someone or for some activity | Synonyms: answerability, answerableness |
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| achievability | (noun) the state of being achievable | Synonyms: attainability, attainableness |
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| adaptability | (noun) the ability to change (or be changed) to fit changed circumstances | - |
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| admirability | (noun) admirable excellence | Synonyms: admirableness, wonderfulness |
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| admissibility | (noun) acceptability by virtue of being admissible | - |
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| adorability | (noun) extreme attractiveness | Synonyms: adorableness |
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| advisability | (noun) the quality of being advisable | - |
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| affability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affableness, amiability, amiableness, bonhomie, geniality |
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| agreeability | (noun) a temperamental disposition to be agreeable | Synonyms: agreeableness |
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| algarobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarroba, algarrobilla |
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| algarrobilla | (noun) mesquite pod used in tanning and dyeing | Synonyms: algarobilla, algarroba |
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| alterability | (noun) the quality of being alterable | - |
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| amenability | (noun) the trait of being cooperative | Synonyms: amenableness, cooperativeness |
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| amiability | (noun) a disposition to be friendly and approachable (easy to talk to) | Synonyms: affability, affableness, amiableness, bonhomie, geniality |
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| (noun) a cheerful and agreeable mood | Synonyms: good humor, good humour, good temper |
| amicability | (noun) having a disposition characterized by warmth and friendliness | Synonyms: amicableness |
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| (noun) a disinclination to quarrel | Synonyms: amicableness |
| answerability | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerableness |
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| applicability | (noun) relevance by virtue of being applicable to the matter at hand | Synonyms: pertinence, pertinency |
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| approachability | (noun) the attribute of being easy to meet or deal with | Synonyms: accessibility |
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| arability | (noun) the quality of land that is appropriate for cultivation | - |
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| assailability | (noun) vulnerability to forceful attack | - |
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| assibilate | (verb) change into a sibilant | - |
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| (verb) insert a sibilant sound before or after (another sound) | - |
| assibilation | (noun) pronunciation with a sibilant (hissing or whistling) sound | Synonyms: sibilation |
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| (noun) the development of a consonant phoneme into a sibilant | - |
| assimilability | (noun) Capability of being taken in and utilized as nourishment. | - |
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| associability | (noun) the capability of being easily associated or joined or connected in thought | Synonyms: associableness |
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| atrabilious | (adjective) irritable as if suffering from indigestion | Synonyms: bilious, dyspeptic, liverish |
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| attainability | (noun) the state of being achievable | Synonyms: achievability, attainableness |
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| audibility | (noun) quality or fact or degree of being audible or perceptible by the ear | Synonyms: audibleness |
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| automobile | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, car, machine, motorcar |
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| (verb) travel in an automobile | - |
| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| availability | (noun) the quality of being at hand when needed | Synonyms: accessibility, availableness, handiness |
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| believability | (noun) the quality of being believable or trustworthy | Synonyms: credibility, credibleness |
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| bendability | (noun) the property of being easily bent without breaking | Synonyms: pliability |
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| bilabial | (adjective) of or relating to or being a speech sound that is articulated using both lips | - |
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| (noun) a consonant that is articulated using both lips; /p/ or /b/ or /w/ | - |
| bilabiate | (adjective) having two lips | Synonyms: two-lipped |
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| bilateral | (adjective) having two sides or parts | Synonyms: two-sided |
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| (adjective) affecting or undertaken by two parties | - |
| (adjective) having identical parts on each side of an axis | Synonyms: bilaterally symmetric, bilaterally symmetrical, isobilateral |
| bilateralism | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilaterality |
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| bilaterality | (noun) the property of being symmetrical about a vertical plane | Synonyms: bilateral symmetry, bilateralism |
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| bilaterally | (adverb) with the involvement of two parties or governments | - |
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| (adverb) so as to involve two sides or parts | - |
| bilberry | (noun) blue-black berries similar to American blueberries | Synonyms: European blueberry, whortleberry |
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| (noun) erect blueberry of western United States having solitary flowers and somewhat sour berries | Synonyms: mountain blue berry, thin-leaved bilberry, Viccinium membranaceum |
| (noun) erect European blueberry having solitary flowers and blue-black berries | Synonyms: blaeberry, Viccinium myrtillus, whinberry, whortleberry |
| bilby | (noun) bandicoot with leathery ears like a rabbit | Synonyms: Macrotis lagotis, rabbit-eared bandicoot, rabbit bandicoot |
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| bile | (noun) a digestive juice secreted by the liver and stored in the gallbladder; aids in the digestion of fats | Synonyms: gall |
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| bilestone | (noun) a calculus formed in the gall bladder or its ducts | Synonyms: gallstone |
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| bilge | (noun) where the sides of the vessel curve in to form the bottom | - |
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| (noun) water accumulated in the bilge of a ship | Synonyms: bilge water |
| (verb) take in water at the bilge | Synonyms: take in water |
| (verb) cause to leak | - |
| bilges | (noun) in a vessel with two hulls, an enclosed area between the frames at each side | - |
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| bilgewater | (noun) pretentious or silly talk or writing | Synonyms: baloney, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| bilgy | (adjective) smelling like bilge water | - |
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| bilharzia | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharziasis, schistosomiasis |
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| bilharziasis | (noun) an infestation with or a resulting infection caused by a parasite of the genus Schistosoma; common in the tropics and Far East; symptoms depend on the part of the body infected | Synonyms: bilharzia, schistosomiasis |
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| biliary | (adjective) relating to the bile ducts or the gallbladder | - |
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| (adjective) relating to or containing bile | Synonyms: bilious |
| bilimbi | (noun) East Indian evergreen tree bearing very acid fruit | Synonyms: Averrhoa bilimbi |
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| bilinear | (adjective) linear with respect to each of two variables or positions | - |
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| bilingual | (adjective) using or knowing two languages | - |
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| (noun) a person who speaks two languages fluently | Synonyms: bilingualist |
| bilingualism | (noun) the ability to speak two languages colloquially | - |
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| bilingualist | (noun) a person who speaks two languages fluently | Synonyms: bilingual |
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| bilingually | (adverb) in a bilingual manner | - |
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| bilious | (adjective) relating to or containing bile | Synonyms: biliary |
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| (adjective) irritable as if suffering from indigestion | Synonyms: atrabilious, dyspeptic, liverish |
| (adjective) suffering from or suggesting a liver disorder or gastric distress | Synonyms: liverish, livery |
| biliousness | (noun) a disposition to exhibit uncontrolled anger | Synonyms: irritability, peevishness, pettishness, snappishness, surliness, temper |
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| (noun) gastric distress caused by a disorder of the liver or gall bladder | - |
| bilirubin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: haematoidin, hematoidin |
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| bilk | (verb) escape, either physically or mentally | Synonyms: elude, evade |
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| (verb) evade payment to | - |
| (verb) cheat somebody out of what is due, especially money | - |
| (verb) hinder or prevent (the efforts, plans, or desires) of | Synonyms: baffle, cross, foil, frustrate, queer, scotch, spoil, thwart |
| bill | (noun) the entertainment offered at a public presentation | - |
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| (noun) horny projecting mouth of a bird | Synonyms: beak, neb, nib, pecker |
| (noun) a brim that projects to the front to shade the eyes | Synonyms: eyeshade, peak, visor, vizor |
| (noun) a cutting tool with a sharp edge | Synonyms: billhook |
| (noun) a sign posted in a public place as an advertisement | Synonyms: card, notice, placard, poster, posting |
| (noun) an itemized statement of money owed for goods shipped or services rendered | Synonyms: account, invoice |
| (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: broadsheet, broadside, circular, flier, flyer, handbill, throwaway |
| (noun) a statute in draft before it becomes law | Synonyms: measure |
| (noun) a list of particulars (as a playbill or bill of fare) | - |
| (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, Federal Reserve note, government note, greenback, note |
| (verb) advertise especially by posters or placards | - |
| (verb) publicize or announce by placards | Synonyms: placard |
| (verb) demand payment | Synonyms: charge |
| billabong | (noun) a branch of a river made by water flowing from the main stream only when the water level is high | - |
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| (noun) a stagnant pool of water in the bed of a stream that flows intermittently | - |
| billboard | (noun) large outdoor signboard | Synonyms: hoarding |
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| billed | (adjective) having a beak or bill as specified | - |
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| billet | (noun) lodging for military personnel (especially in a private home) | - |
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| (noun) a short personal letter | Synonyms: line, note, short letter |
| (verb) provide housing for (military personnel) | Synonyms: canton, quarter |
| billfish | (noun) giant warm-water game fish having a prolonged and rounded toothless upper jaw | - |
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| (noun) elongate European surface-dwelling predacious fishes with long toothed jaws; abundant in coastal waters | Synonyms: gar, needlefish |
| (noun) primitive predaceous North American fish covered with hard scales and having long jaws with needlelike teeth | Synonyms: gar, garfish, garpike, Lepisosteus osseus |
| (noun) slender long-beaked fish of temperate Atlantic waters | Synonyms: saury, Scomberesox saurus |
| billfold | (noun) a pocket-size case for holding papers and paper money | Synonyms: notecase, pocketbook, wallet |
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| billhook | (noun) a cutting tool with a sharp edge | Synonyms: bill |
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| billiard | (adjective) of or relating to billiards | - |
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| billiards | (noun) any of several games played on rectangular cloth-covered table (with cushioned edges) in which long tapering cue sticks are used to propel ivory (or composition) balls | - |
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| billing | (noun) request for payment of a debt | Synonyms: charge |
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| billingsgate | (noun) foul-mouthed or obscene abuse | Synonyms: scurrility |
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| billion | (adjective) denoting a quantity consisting of one thousand million items or units in the United States | - |
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| (adjective) denoting a quantity consisting of one million million items or units in Great Britain | - |
| (noun) the number that is represented as a one followed by 9 zeros | Synonyms: 1000000000, one thousand million |
| (noun) the number that is represented as a one followed by 12 zeros; in the United Kingdom the usage followed in the United States is frequently seen | Synonyms: 1000000000000, one million million |
| (noun) a very large indefinite number (usually hyperbole) | Synonyms: bazillion, gazillion, jillion, million, trillion, zillion |
| billionaire | (noun) a very rich person whose material wealth is valued at more than a billion dollars | - |
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| billionth | (adjective) the ordinal number of one billion in counting order | - |
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| (noun) one part in a billion equal parts | Synonyms: one-billionth |
| (noun) position 1,000,000,000 in a countable series of things | - |
| billow | (noun) a large sea wave | Synonyms: surge |
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| (verb) become inflated | Synonyms: balloon, inflate |
| (verb) rise and move, as in waves or billows | Synonyms: heave, surge |
| (verb) rise up as if in waves | Synonyms: wallow |
| (verb) move with great difficulty | - |
| billowing | (adjective) characterized by great swelling waves or surges | Synonyms: billowy, surging |
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| billowy | (adjective) characterized by great swelling waves or surges | Synonyms: billowing, surging |
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| billy | (noun) male goat | Synonyms: billy goat, he-goat |
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| (noun) a short stout club used primarily by policemen | Synonyms: baton, billy club, billystick, nightstick, truncheon |
| billyo | (noun) an unimaginably large amount | Synonyms: all get out, billy-ho, billyoh |
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| billyoh | (noun) an unimaginably large amount | Synonyms: all get out, billy-ho, billyo |
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| billystick | (noun) a short stout club used primarily by policemen | Synonyms: baton, billy, billy club, nightstick, truncheon |
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| bilobate | (adjective) divided into two lobes | Synonyms: bilobated, bilobed |
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| bilobated | (adjective) divided into two lobes | Synonyms: bilobate, bilobed |
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| bilobed | (adjective) divided into two lobes | Synonyms: bilobate, bilobated |
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| bilocation | (noun) the ability (said of certain Roman Catholic saints) to exist simultaneously in two locations | - |
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| bilocular | (adjective) divided into or containing two cells or chambers | Synonyms: biloculate |
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| biloculate | (adjective) divided into or containing two cells or chambers | Synonyms: bilocular |
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| bilsted | (noun) a North American tree of the genus Liquidambar having prickly spherical fruit clusters and fragrant sap | Synonyms: American sweet gum, Liquidambar styraciflua, red gum, sweet gum, sweet gum tree |
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| biltong | (noun) meat that is salted and cut into strips and dried in the sun | - |
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| bloodmobile | (noun) a motor vehicle equipped to collect blood donations | - |
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| bluebill | (noun) diving ducks of North America having a bluish-grey bill | Synonyms: broadbill, scaup, scaup duck |
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| boatbill | (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, broadbill, Cochlearius cochlearius |
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| bombilate | (verb) make a buzzing sound | Synonyms: bombinate, buzz |
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| bombilation | (noun) sound of rapid vibration | Synonyms: bombination, buzz |
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| bookmobile | (noun) a van with shelves of books; serves as a mobile library or bookstore | - |
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| breakability | (noun) quality of being easily damaged or destroyed | Synonyms: fragility, frangibility, frangibleness |
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| broadbill | (noun) small birds of the Old World tropics having bright plumage and short wide bills | - |
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| (noun) freshwater duck of the Northern Hemisphere having a broad flat bill | Synonyms: Anas clypeata, shoveler, shoveller |
| (noun) diving ducks of North America having a bluish-grey bill | Synonyms: bluebill, scaup, scaup duck |
| (noun) tropical American heron related to night herons | Synonyms: boat-billed heron, boatbill, Cochlearius cochlearius |