| racetrack | (noun) a course over which races are run | Synonyms: racecourse, raceway, track |
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| rack | (noun) a rapid gait of a horse in which each foot strikes the ground separately | Synonyms: single-foot |
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| (noun) a form of torture in which pain is inflicted by stretching the body | - |
| (noun) a support for displaying ot holding various articles | Synonyms: stand |
| (noun) an instrument of torture that stretches or disjoints or mutilates victims | Synonyms: wheel |
| (noun) the destruction or collapse of something | Synonyms: wrack |
| (noun) rib section of a forequarter of veal or pork or especially lamb or mutton | - |
| razorback | (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 |
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| (noun) any of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin | Synonyms: rorqual |
| rickrack | (noun) a narrow zigzag ribbon used as trimming | Synonyms: ricrac |
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| 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 | - |
| rucksack | (noun) a bag carried by a strap on your back or shoulder | Synonyms: back pack, backpack, haversack, knapsack, packsack |
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| sack | (noun) the termination of someone's employment (leaving them free to depart) | Synonyms: discharge, dismissal, dismission, firing, liberation, release, sacking |
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| (noun) the plundering of a place by an army or mob; usually involves destruction and slaughter | - |
| (noun) a bag made of paper or plastic for holding customer's purchases | Synonyms: carrier bag, paper bag, poke |
| (noun) a loose-fitting dress hanging straight from the shoulders without a waist | Synonyms: chemise, shift |
| (noun) a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily | Synonyms: hammock |
| (noun) a woman's full loose hiplength jacket | Synonyms: sacque |
| (noun) any of various light dry strong white wine from Spain and Canary Islands (including sherry) | - |
| (noun) the quantity contained in a sack | Synonyms: sackful |
| (noun) an enclosed space | Synonyms: pocket, pouch, sac |
| 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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| shack | (noun) small crude shelter used as a dwelling | Synonyms: hovel, hut, hutch, shanty |
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| shoeblack | (noun) a person who polishes shoes and boots | Synonyms: bootblack |
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| sidetrack | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, siding, turnout |
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| silverback | (noun) an adult male gorilla with grey hairs across the back | - |
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| sixpack | (noun) a carton containing six bottles or cans | Synonyms: six-pack, six pack |
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| skipjack | (noun) oceanic schooling tuna of considerable value in Pacific but less in Atlantic; reaches 75 pounds; very similar to if not the same as oceanic bonito | Synonyms: Euthynnus pelamis, skipjack tuna |
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| (noun) medium-sized tuna-like food fish of warm Atlantic and Pacific waters; less valued than tuna | Synonyms: Atlantic bonito, Sarda sarda |
| (noun) able to right itself when on its back by flipping into the air with a clicking sound | Synonyms: click beetle, snapping beetle |
| slack | (noun) a cord or rope or cable that is hanging loosely | - |
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| (noun) the quality of being loose (not taut) | Synonyms: slackness |
| (noun) a stretch of water without current or movement | Synonyms: slack water |
| (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, quagmire |
| (noun) a noticeable deterioration in performance or quality | Synonyms: drop-off, falling off, falloff, slump |
| (noun) dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve | - |
| slingback | (noun) a shoe that has a strap that wraps around the heel | Synonyms: sling |
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| smack | (noun) the act of smacking something; a blow delivered with an open hand | Synonyms: slap, smacking |
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| (noun) an enthusiastic kiss | Synonyms: smooch |
| (noun) street names for heroin | Synonyms: big H, hell dust, nose drops, scag, skag, thunder |
| (noun) a sailing ship (usually rigged like a sloop or cutter) used in fishing and sailing along the coast | - |
| (noun) the taste experience when a savoury condiment is taken into the mouth | Synonyms: flavor, flavour, nip, relish, sapidity, savor, savour, tang |
| (noun) a blow from a flat object (as an open hand) | Synonyms: slap |
| smokestack | (noun) a large tall chimney through which combustion gases and smoke can be evacuated | Synonyms: stack |
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| snack | (noun) a light informal meal | Synonyms: bite, collation |
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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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| soundtrack | (noun) sound recording on a narrow strip of a motion picture film | - |
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| stack | (noun) a large tall chimney through which combustion gases and smoke can be evacuated | Synonyms: smokestack |
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| (noun) a storage device that handles data so that the next item to be retrieved is the item most recently stored (LIFO) | Synonyms: push-down storage, push-down store |
| (noun) a list in which the next item to be removed is the item most recently stored (LIFO) | Synonyms: push-down list, push-down stack |
| (noun) an orderly pile | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, sight, slew, spate, tidy sum, wad |
| steeplejack | (noun) someone who builds or maintains very tall structures | - |
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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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| supplejack | (noun) walking stick made from the wood of an American tropical vine | - |
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| tack | (noun) sailing a zigzag course | - |
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| (noun) (nautical) the act of changing tack | Synonyms: tacking |
| (noun) a short nail with a sharp point and a large head | - |
| (noun) gear for a horse | Synonyms: saddlery, stable gear |
| (noun) (nautical) a line (rope or chain) that regulates the angle at which a sail is set in relation to the wind | Synonyms: mainsheet, sheet, shroud, weather sheet |
| (noun) the heading or position of a vessel relative to the trim of its sails | - |
| 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 | - |
| tamarack | (noun) medium-sized larch of Canada and northern United States including Alaska having a broad conic crown and rust-brown scaly bark | Synonyms: American larch, black larch, Larix laricina |
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| throwback | (noun) a reappearance of an earlier characteristic | Synonyms: atavism, reversion |
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| (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: atavist |
| thumbtack | (noun) a tack for attaching papers to a bulletin board or drawing board | Synonyms: drawing pin, pushpin |
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| thwack | (noun) a hard blow with a flat object | - |
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| ticktack | (noun) system of signalling by hand signs used by bookmakers at racetracks | - |
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| tieback | (noun) a device (as a decorative loop of cord or fabric) for holding or drawing something back | Synonyms: pullback |
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| tintack | (noun) tack or small nail of tinned iron | - |
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| toastrack | (noun) a rack for holding slices of toast | - |
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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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| track | (noun) the act of participating in an athletic competition involving running on a track | Synonyms: running |
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| (noun) any road or path affording passage especially a rough one | Synonyms: cart track, cartroad |
| (noun) a bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll | Synonyms: rail, rails, runway |
| (noun) a pair of parallel rails providing a runway for wheels | - |
| (noun) a groove on a phonograph recording | - |
| (noun) (computer science) one of the circular magnetic paths on a magnetic disk that serve as a guide for writing and reading data | Synonyms: data track |
| (noun) a course over which races are run | Synonyms: racecourse, racetrack, raceway |
| (noun) an endless metal belt on which tracked vehicles move over the ground | Synonyms: caterpillar track, caterpillar tread |
| (noun) evidence pointing to a possible solution | Synonyms: lead, trail |
| (noun) a distinct selection of music from a recording or a compact disc | Synonyms: cut |
| (noun) a line or route along which something travels or moves | Synonyms: course, path |
| wetback | (noun) (ethnic slur) offensive term for a person of Mexican descent | Synonyms: greaser, taco |
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| whack | (noun) the act of hitting vigorously | Synonyms: belt, knock, rap, whang |
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| (noun) the sound made by a sharp swift blow | - |
| 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 | - |
| wisecrack | (noun) witty remark | Synonyms: crack, quip, sally |
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| wrack | (noun) dried seaweed especially that cast ashore | - |
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| (noun) growth of marine vegetation especially of the large forms such as rockweeds and kelp | Synonyms: sea wrack |
| (noun) the destruction or collapse of something | Synonyms: rack |
| yack | (noun) noisy talk | Synonyms: cackle, chatter, yak, yakety-yak |
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| 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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