| aback | (adverb) by surprise | - |
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| (adverb) having the wind against the forward side of the sails | - |
| ahorseback | (adjective) traveling on horseback | Synonyms: ahorse |
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| (adverb) on the back of a horse | Synonyms: ahorse, horseback |
| back | (adjective) related to or located at the back | - |
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| (adjective) of an earlier date | - |
| (adjective) located at or near the back of an animal | Synonyms: hind, hinder |
| (noun) (American football) the position of a player on a football team who is stationed behind the line of scrimmage | - |
| (noun) the side that goes last or is not normally seen | Synonyms: rear |
| (noun) a support that you can lean against while sitting | Synonyms: backrest |
| (noun) the part of a garment that covers the back of your body | - |
| (noun) the protective covering on the front, back, and spine of a book | Synonyms: binding, book binding, cover |
| (noun) the posterior part of a human (or animal) body from the neck to the end of the spine | Synonyms: dorsum |
| (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: backbone, rachis, spinal column, spine, vertebral column |
| (noun) the part of something that is furthest from the normal viewer | Synonyms: rear |
| (noun) (football) a person who plays in the backfield | - |
| (adverb) at or to or toward the back or rear | Synonyms: backward, backwards, rearward, rearwards |
| (adverb) in or to or toward a past time | Synonyms: backward |
| (adverb) in repayment or retaliation | - |
| (adverb) in or to or toward a former location | - |
| (adverb) in or to or toward an original condition | - |
| (adverb) in reply | - |
| (verb) establish as valid or genuine | Synonyms: back up |
| (verb) strengthen by providing with a back or backing | - |
| (verb) shift to a counterclockwise direction | - |
| (verb) place a bet on | Synonyms: bet on, gage, game, punt, stake |
| (verb) travel backward | - |
| (verb) cause to travel backward | - |
| (verb) support financial backing for | - |
| (verb) be behind; approve of | Synonyms: endorse, indorse, plump for, plunk for, support |
| (verb) give support or one's approval to | Synonyms: endorse, indorse, second |
| (verb) be in back of | - |
| bareback | (adjective) riding without a saddle | Synonyms: barebacked |
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| (adverb) without a saddle | Synonyms: barebacked |
| biofeedback | (noun) a training program in which a person is given information about physiological processes (heart rate or blood pressure) that is not normally available with the goal of gaining conscious control of them | - |
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| blowback | (noun) Blowback is a system of operation for self-loading firearms that obtains energy from the motion of the cartridge case as it is pushed to the rear by expanding gases created by the ignition of the propellant charge. | - |
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| (noun) misinformation resulting from the recirculation into the source country of disinformation previously planted abroad by that country's intelligence service | - |
| (noun) the backward escape of gases and unburned gunpowder after a gun is fired | Synonyms: backfire |
| buyback | (noun) the act of purchasing back something previously sold | Synonyms: redemption, repurchase |
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| callback | (noun) a request by the manufacturer of a defective product to return the product (as for replacement or repair) | Synonyms: recall |
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| canvasback | (noun) North American wild duck valued for sport and food | Synonyms: Aythya valisineria, canvasback duck |
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| clawback | (noun) finding a way to take money back from people that they were given in another way | - |
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| comeback | (noun) return by a celebrity to some previously successful activity | - |
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| (noun) a quick reply to a question or remark (especially a witty or critical one) | Synonyms: counter, rejoinder, replication, retort, return, riposte |
| cornerback | (noun) a defensive football player stationed outside the linebackers | - |
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| crookback | (adjective) characteristic of or suffering from kyphosis, an abnormality of the vertebral column | Synonyms: crookbacked, gibbous, humpbacked, humped, hunchbacked, kyphotic |
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| (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: humpback, hunchback |
| cutback | (noun) a reduction in quantity or rate | - |
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| diamondback | (noun) large deadly rattlesnake with diamond-shaped markings | Synonyms: Crotalus adamanteus, diamondback rattlesnake |
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| dieback | (noun) a disease of plants characterized by the gradual dying of the young shoots starting at the tips and progressing to the larger branches | - |
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| drawback | (noun) the quality of being a hindrance | - |
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| fallback | (noun) to break off a military action with an enemy | Synonyms: disengagement, pullout |
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| fatback | (noun) salt pork from the back of a hog carcass | - |
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| feedback | (noun) response to an inquiry or experiment | - |
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| (noun) the process in which part of the output of a system is returned to its input in order to regulate its further output | - |
| finback | (noun) large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific | Synonyms: Balaenoptera physalus, common rorqual, fin whale, finback whale |
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| flashback | (noun) a transition (in literary or theatrical works or films) to an earlier event or scene that interrupts the normal chronological development of the story | - |
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| (noun) an unexpected but vivid recurrence of a past experience (especially a recurrence of the effects of an hallucinogenic drug taken much earlier) | - |
| follback | (verb) to return someone's following of you on a social media platform | - |
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| fullback | (noun) (American football) the position of a back on a football team, generally larger in size than halfbacks | - |
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| (noun) (football) the running back who plays the fullback position on the offensive team | - |
| (verb) play the fullback | - |
| grayback | (noun) a dowitcher with a grey back | Synonyms: greyback, Limnodromus griseus |
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| (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, greyback, knot |
| greenback | (noun) a piece of paper money (especially one issued by a central bank) | Synonyms: bank bill, bank note, banker's bill, banknote, bill, Federal Reserve note, government note, note |
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| greyback | (noun) a dowitcher with a grey back | Synonyms: grayback, Limnodromus griseus |
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| (noun) a sandpiper that breeds in the Arctic and winters in the Southern Hemisphere | Synonyms: Calidris canutus, grayback, knot |
| (noun) `Johnny' was applied as a nickname for Confederate soldiers by the Federal soldiers in the American Civil War; `greyback' derived from their grey Confederate uniforms | Synonyms: Johnny, Johnny Reb, Reb, Rebel |
| halfback | (noun) (American football) the position of a back on a football team, generally smaller in size than a fullback | - |
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| (noun) (football) the running back who plays the offensive halfback position | - |
| hardback | (adjective) having a hard back or cover | Synonyms: hardbacked, hardbound, hardcover |
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| (noun) a book with cardboard or cloth or leather covers | Synonyms: hardcover |
| hatchback | (noun) a sloping rear car door that is lifted to open | Synonyms: hatch, hatchback door, liftgate |
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| (noun) a car having a hatchback door | - |
| hogback | (noun) a narrow ridge of hills | Synonyms: horseback |
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| horseback | (noun) the back of a horse | - |
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| (noun) a narrow ridge of hills | Synonyms: hogback |
| (adverb) on the back of a horse | Synonyms: ahorse, ahorseback |
| huckaback | (noun) toweling consisting of coarse absorbent cotton or linen fabric | Synonyms: huck |
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| humpback | (noun) large whalebone whale with long flippers noted for arching or humping its back as it dives | Synonyms: humpback whale, Megaptera novaeangliae |
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| (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: crookback, hunchback |
| (noun) an abnormal backward curve to the vertebral column | Synonyms: hunchback, kyphosis |
| hunchback | (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: crookback, humpback |
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| (noun) an abnormal backward curve to the vertebral column | Synonyms: humpback, kyphosis |
| 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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| leatherback | (noun) wide-ranging marine turtle with flexible leathery carapace; largest living turtle | Synonyms: Dermochelys coriacea, leatherback turtle, leathery turtle |
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| lobsterback | (noun) British soldier; so-called because of his red coat (especially during the American Revolution) | Synonyms: redcoat |
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| mossback | (noun) an extremely old-fashioned conservative | - |
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| outback | (adjective) inaccessible and sparsely populated | Synonyms: remote |
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| (noun) the bush country of the interior of Australia | - |
| paperback | (adjective) (of books) having a flexible binding | Synonyms: paperbacked |
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| (noun) a book with paper covers | Synonyms: paper-back book, paperback book, soft-cover, soft-cover book, softback, softback book |
| payback | (noun) the act of taking revenge (harming someone in retaliation for something harmful that they have done) especially in the next life | Synonyms: retribution, vengeance |
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| (noun) financial return or reward (especially returns equal to the initial investment) | - |
| pickaback | (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pig-a-back, piggyback |
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| (adverb) on a railroad flatcar | Synonyms: pig-a-back, piggyback |
| piggyback | (noun) the act of carrying something piggyback | - |
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| (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pickaback, pig-a-back |
| (adverb) on a railroad flatcar | Synonyms: pickaback, pig-a-back |
| (verb) bring into alignment with | - |
| (verb) support on the back and shoulders | - |
| (verb) haul by railroad car | - |
| (verb) haul truck trailers loaded with commodities on railroad cars | - |
| (verb) ride on someone's shoulders or back | - |
| playback | (noun) the act of reproducing recorded sound | - |
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| (noun) electronic equipment comprising the part of a tape recorder that reproduces the recorded material | - |
| prickleback | (noun) small elongate fishes of shallow northern seas; a long dorsal fin consists entirely of spines | - |
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| (noun) small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research | Synonyms: stickleback |
| pullback | (noun) (military) the act of pulling back (especially an orderly withdrawal of troops) | - |
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| (noun) a device (as a decorative loop of cord or fabric) for holding or drawing something back | Synonyms: tieback |
| quarterback | (noun) (American football) the position of the football player in the backfield who directs the offensive play of his team | Synonyms: field general, signal caller |
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| (noun) (football) the person who plays quarterback | Synonyms: field general, signal caller |
| (verb) play the quarterback | - |
| razorback | (adjective) having a sharp narrow back | Synonyms: razor-backed |
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| (noun) a mongrel hog with a thin body and long legs and a ridged back; a wild or semi-wild descendant of improved breeds; found chiefly in the southeastern United States | Synonyms: razorback hog, razorbacked hog |
| (noun) any of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin | Synonyms: rorqual |
| rollback | (noun) the act of forcing the enemy to withdraw | Synonyms: push back |
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| (noun) reducing prices back to some earlier level | - |
| saddleback | (noun) a double sloping roof with a ridge and gables at each end | Synonyms: gable roof, saddle roof, saddleback roof |
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| (noun) a pass or ridge that slopes gently between two peaks (is shaped like a saddle) | Synonyms: saddle |
| setback | (noun) an unfortunate happening that hinders or impedes; something that is thwarting or frustrating | Synonyms: black eye, blow, reversal, reverse |
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| silverback | (noun) an adult male gorilla with grey hairs across the back | - |
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| slingback | (noun) a shoe that has a strap that wraps around the heel | Synonyms: sling |
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| softback | (noun) a book with paper covers | Synonyms: paper-back book, paperback, paperback book, soft-cover, soft-cover book, softback book |
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| stickleback | (noun) small (2-4 inches) pugnacious mostly scaleless spiny-backed fishes of northern fresh and littoral waters having elaborate courtship; subjects of much research | Synonyms: prickleback |
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| swayback | (adjective) having abnormal sagging of the spine (especially in horses) | Synonyms: dipped, lordotic, swaybacked |
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| sweptback | (adjective) used of hair | Synonyms: backswept |
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| (adjective) (especially of aircraft wings) angled rearward from the point of attachment | - |
| tailback | (noun) (American football) the position of the offensive back on a football team who lines up farthest from the line of scrimmage | - |
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| (noun) (American football) the person who plays tailback | - |
| throwback | (adjective) characteristic of an atavist | Synonyms: atavistic |
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| (noun) a reappearance of an earlier characteristic | Synonyms: atavism, reversion |
| (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: atavist |
| tieback | (noun) a device (as a decorative loop of cord or fabric) for holding or drawing something back | Synonyms: pullback |
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| touchback | (noun) (American football) a play in which the opposing team has kicked the football into your end zone | - |
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| wetback | (noun) (ethnic slur) offensive term for a person of Mexican descent | Synonyms: greaser, taco |
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| wingback | (noun) (American football) the position of the offensive back who lines up behind or outside the end | - |
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| (noun) (football) the person who plays wingback | - |
| zwieback | (noun) slice of sweet raised bread baked again until it is brown and hard and crisp | Synonyms: Brussels biscuit, rusk, twice-baked bread |
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