| backband | (noun) a broad band that passes over the back of a horse and supports the shafts of a vehicle | - |
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| backbeat | (noun) a loud steady beat | - |
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| backbench | (noun) any of the seats occupied by backbenchers in the House of Commons | - |
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| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backbend | (noun) an acrobatic feat in which the trunk is bent backward from a standing position until the hands touch the floor | - |
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| backbiter | (noun) one who attacks the reputation of another by slander or libel | Synonyms: defamer, libeler, maligner, slanderer, traducer, vilifier |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| backboard | (noun) a board used to support the back of someone or something | - |
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| (noun) a raised vertical board with basket attached; used to play basketball | Synonyms: basketball backboard |
| backbone | (noun) the part of a network that connects other networks together | - |
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| (noun) the part of a book's cover that encloses the inner side of the book's pages and that faces outward when the book is shelved | Synonyms: spine |
| (noun) fortitude and determination | Synonyms: grit, gumption, guts, moxie, sand |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, rachis, spinal column, spine, vertebral column |
| (noun) a central cohesive source of support and stability | Synonyms: anchor, keystone, linchpin, lynchpin, mainstay |
| bankbook | (noun) a record of deposits and withdrawals and interest held by depositors at certain banks | Synonyms: passbook |
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| blackball | (noun) the act of excluding someone by a negative vote or veto | Synonyms: barring |
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| 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 |
| 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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| blockbuster | (noun) an unusually successful hit with widespread popularity and huge sales (especially a movie or play or recording or novel) | Synonyms: megahit, smash hit |
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| (noun) a large bomb used to demolish extensive areas (as a city block) | - |
| bookbinder | (noun) a worker whose trade is binding books | - |
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| bookbindery | (noun) a bookbinder's workshop; a place for binding books | - |
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| bookbinding | (noun) the craft of binding books | - |
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| brickbat | (noun) blunt criticism | - |
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| (noun) a fragment of brick used as a weapon | - |
| buckbean | (noun) perennial plant of Europe and America having racemes of white or purplish flowers and intensely bitter trifoliate leaves; often rooting at water margin and spreading across the surface | Synonyms: bog myrtle, bogbean, marsh trefoil, Menyanthes trifoliata, water shamrock |
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| buckboard | (noun) an open horse-drawn carriage with four wheels; has a seat attached to a flexible board between the two axles | - |
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| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| checkbook | (noun) a book issued to holders of checking accounts | Synonyms: chequebook |
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| cheekbone | (noun) the arch of bone beneath the eye that forms the prominence of the cheek | Synonyms: jugal bone, malar, malar bone, os zygomaticum, zygomatic, zygomatic bone |
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| cookbook | (noun) a book of recipes and cooking directions | Synonyms: cookery book |
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| corkboard | (noun) a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking | - |
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| crookback | (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: humpback, hunchback |
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| duckbill | (noun) small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae | Synonyms: duck-billed platypus, duckbilled platypus, Ornithorhynchus anatinus, platypus |
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| (noun) primitive fish of the Mississippi valley having a long paddle-shaped snout | Synonyms: paddlefish, Polyodon spathula |
| duckboard | (noun) a boardwalk laid across muddy ground | - |
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| hackberry | (noun) small edible dark purple to black berry with large pits; southern United States | Synonyms: sugarberry |
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| (noun) any of various trees of the genus Celtis having inconspicuous flowers and small berrylike fruits | Synonyms: nettle tree |
| hackbut | (noun) an obsolete firearm with a long barrel | Synonyms: arquebus, hagbut, harquebus |
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| hawkbill | (noun) pugnacious tropical sea turtle with a hawk-like beak; source of food and the best tortoiseshell | Synonyms: Eretmochelys imbricata, hawksbill, hawksbill turtle, tortoiseshell turtle |
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| hawkbit | (noun) any of various common wildflowers of the genus Leontodon; of temperate Eurasia to Mediterranean regions | - |
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| inkberry | (noun) evergreen holly of eastern North America with oblong leathery leaves and small black berries | Synonyms: evergreen winterberry, gall-berry, gallberry, Ilex glabra |
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| inkblot | (noun) a blot made with ink | - |
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| jackboot | (noun) (19th century) a man's high tasseled boot | Synonyms: hessian, Hessian boot, Wellington, Wellington boot |
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| kb | (noun) a unit of information equal to 1000 bits | Synonyms: kbit, kilobit |
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| kbit | (noun) a unit of information equal to 1000 bits | Synonyms: kb, kilobit |
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| kickback | (noun) a commercial bribe paid by a seller to a purchasing agent in order to induce the agent to enter into the transaction | - |
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| linkboy | (noun) (formerly) an attendant hired to carry a torch for pedestrians in dark streets | Synonyms: linkman |
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| lockbox | (noun) a fireproof metal strongbox (usually in a bank) for storing valuables | Synonyms: deposit box, safe-deposit, safe-deposit box, safety-deposit, safety deposit box |
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| neckband | (noun) a band that fits around the neck and is usually folded over | Synonyms: collar |
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| (noun) necklace that fits tightly around a woman's neck | Synonyms: choker, collar, dog collar |
| (noun) a band around the collar of a garment | - |
| sackbut | (noun) a medieval musical instrument resembling a trombone | - |
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| sickbag | (noun) a bag provided on an airplane for passengers who are suffering from airsickness and need to vomit | Synonyms: sick bag |
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| sickbay | (noun) (nautical) a room for the treatment of the sick or injured (as on a ship) | Synonyms: sick berth |
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| sickbed | (noun) the bed on which a sick person lies | - |
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| skunkbush | (noun) deciduous shrub of California with unpleasantly scented usually trifoliate leaves and edible fruit | Synonyms: Rhus trilobata, squaw-bush, squawbush |
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| stickball | (noun) a form of baseball played in the streets with a rubber ball and broomstick handle | Synonyms: stickball game |
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| stinkbird | (noun) crested ill-smelling South American bird whose young have claws on the first and second digits of the wings | Synonyms: hoactzin, hoatzin, Opisthocomus hoazin |
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| stockbroker | (noun) an agent in the buying and selling of stocks and bonds | - |
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| trackball | (noun) an electronic device consisting of a rotatable ball in a housing; used to position the cursor and move images on a computer screen | - |
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| workbag | (noun) container for holding implements and materials for work (especially for sewing) | Synonyms: workbasket, workbox |
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| workbasket | (noun) container for holding implements and materials for work (especially for sewing) | Synonyms: workbag, workbox |
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| workbench | (noun) a strong worktable for a carpenter or mechanic | Synonyms: bench, work bench |
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| workboard | (noun) a horizontal board that provides a supported surface for manual work | Synonyms: work-board |
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| workbook | (noun) a student's book or booklet containing problems with spaces for solving them | - |
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| workbox | (noun) container for holding implements and materials for work (especially for sewing) | Synonyms: workbag, workbasket |
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