| shell | (noun) the hard largely calcareous covering of a mollusc or a brachiopod | - |
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| (noun) hard outer covering or case of certain organisms such as arthropods and turtles | Synonyms: carapace, cuticle, shield |
| (noun) ammunition consisting of a cylindrical metal casing containing an explosive charge and a projectile; fired from a large gun | - |
| (noun) a metal sheathing of uniform thickness (such as the shield attached to an artillery piece to protect the gunners) | Synonyms: plate, scale |
| (noun) the housing or outer covering of something | Synonyms: case, casing |
| (noun) a very light narrow racing boat | Synonyms: racing shell |
| (noun) a rigid covering that envelops an object | - |
| (noun) the exterior covering of a bird's egg | Synonyms: eggshell |
| (noun) the hard usually fibrous outer layer of some fruits especially nuts | - |
| (noun) the material that forms the hard outer covering of many animals | - |
| shill | (noun) a decoy who acts as an enthusiastic customer in order to stimulate the participation of others | - |
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| shoebill | (noun) large stork-like bird of the valley of the White Nile with a broad bill suggesting a wooden shoe | Synonyms: Balaeniceps rex, shoebird |
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| shortfall | (noun) the property of being an amount by which something is less than expected or required | Synonyms: deficit, shortage |
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| sidewall | (noun) a wall that forms the side of a structure | - |
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| (noun) the side of an automobile tire | - |
| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| skill | (noun) ability to produce solutions in some problem domain | Synonyms: science |
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| (noun) an ability that has been acquired by training | Synonyms: accomplishment, acquirement, acquisition, attainment |
| skull | (noun) the bony skeleton of the head of vertebrates | - |
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| small | (noun) a garment size for a small person | - |
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| (noun) the slender part of the back | - |
| smell | (noun) the act of perceiving the odor of something | Synonyms: smelling |
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| (noun) any property detected by the olfactory system | Synonyms: aroma, odor, odour, olfactory property, scent |
| (noun) the faculty that enables us to distinguish scents | Synonyms: olfaction, olfactory modality, sense of smell |
| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odor, odour, olfactory perception, olfactory sensation |
| (noun) the general atmosphere of a place or situation and the effect that it has on people | Synonyms: feel, feeling, flavor, flavour, look, spirit, tone |
| snowball | (noun) snow pressed into a ball for throwing (playfully) | - |
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| (noun) ball of crushed ice with fruit syrup | - |
| (noun) ball of ice cream covered with coconut and usually chocolate sauce | - |
| (noun) plant having heads of fragrant white trumpet-shaped flowers; grows in sandy arid regions | Synonyms: Abronia elliptica, sweet sand verbena |
| snowbell | (noun) small tree native to Japan | Synonyms: Styrax obassia |
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| snowfall | (noun) precipitation falling from clouds in the form of ice crystals | Synonyms: snow |
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| softball | (noun) a game closely resembling baseball that is played on a smaller diamond and with a ball that is larger | Synonyms: softball game |
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| (noun) ball used in playing softball | - |
| sourball | (noun) round piece of tart hard candy | - |
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| spall | (noun) a fragment broken off from the edge or face of stone or ore and having at least one thin edge | Synonyms: spawl |
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| speedwell | (noun) any plant of the genus Veronica | Synonyms: veronica |
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| spell | (noun) a verbal formula believed to have magical force | Synonyms: charm, magic spell, magical spell |
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| (noun) a psychological state induced by (or as if induced by) a magical incantation | Synonyms: enchantment, trance |
| (noun) a time period for working (after which you will be relieved by someone else) | Synonyms: go, tour, turn |
| (noun) a period of indeterminate length (usually short) marked by some action or condition | Synonyms: patch, piece, while |
| spicemill | (noun) a mill for grinding spices | - |
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| spill | (noun) the act of allowing a fluid to escape | Synonyms: release, spillage |
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| (noun) a sudden drop from an upright position | Synonyms: fall, tumble |
| (noun) a channel that carries excess water over or around a dam or other obstruction | Synonyms: spillway, wasteweir |
| (noun) liquid that is spilled | - |
| spitball | (noun) an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it | Synonyms: spitter |
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| (noun) a projectile made by chewing a piece of paper and shaping it into a sphere | - |
| spoonbill | (noun) wading birds having a long flat bill with a tip like a spoon | - |
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| sporophyll | (noun) leaf in ferns and mosses that bears the sporangia | Synonyms: sporophyl |
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| sportsball | (noun) Sports of an unspecified kind, usually condescending | - |
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| squall | (noun) sudden violent winds; often accompanied by precipitation | - |
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| squill | (noun) an Old World plant of the genus Scilla having narrow basal leaves and pink or blue or white racemose flowers | Synonyms: scilla |
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| (noun) having dense spikes of small white flowers and yielding a bulb with medicinal properties | Synonyms: sea onion, sea squill, Urginea maritima |
| (noun) bulb of the sea squill, which is sliced, dried, and used as an expectorant | - |
| stairwell | (noun) a vertical well around which there is a stairway | - |
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| stall | (noun) a tactic used to mislead or delay | Synonyms: stalling |
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| (noun) small area set off by walls for special use | Synonyms: booth, cubicle, kiosk |
| (noun) a booth where articles are displayed for sale | Synonyms: sales booth, stand |
| (noun) small individual study area in a library | Synonyms: carrel, carrell, cubicle |
| (noun) a compartment in a stable where a single animal is confined and fed | - |
| (noun) seating in the forward part of the main level of a theater | - |
| (noun) a malfunction in the flight of an aircraft in which there is a sudden loss of lift that results in a downward plunge | - |
| standstill | (noun) an interruption of normal activity | Synonyms: stand, tie-up |
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| (noun) a situation in which no progress can be made or no advancement is possible | Synonyms: dead end, deadlock, impasse, stalemate |
| stickball | (noun) a form of baseball played in the streets with a rubber ball and broomstick handle | Synonyms: stickball game |
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| still | (noun) an apparatus used for the distillation of liquids; consists of a vessel in which a substance is vaporized by heat and a condenser where the vapor is condensed | - |
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| (noun) a static photograph (especially one taken from a movie and used for advertising purposes) | - |
| (noun) a plant and works where alcoholic drinks are made by distillation | Synonyms: distillery |
| (noun) (poetic) tranquil silence | Synonyms: hush, stillness |
| storksbill | (noun) any of various plants of the genus Erodium | Synonyms: heron's bill |
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| stroll | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, perambulation, promenade, saunter |
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| swell | (noun) a crescendo followed by a decrescendo | - |
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| (noun) the undulating movement of the surface of the open sea | Synonyms: crestless wave |
| (noun) a rounded elevation (especially one on an ocean floor) | - |
| (noun) a man who is much concerned with his dress and appearance | Synonyms: beau, clotheshorse, dandy, dude, fashion plate, fop, gallant, sheik |
| swill | (noun) wet feed (especially for pigs) consisting of mostly kitchen waste mixed with water or skimmed or sour milk | Synonyms: pigswill, pigwash, slop, slops |
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| tall | (noun) a garment size for a tall person | - |
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| tetherball | (noun) a game with two players who use rackets to strike a ball that is tethered to the top of a pole; the object is to wrap the string around the pole | - |
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| thill | (noun) one of two shafts extending from the body of a cart or carriage on either side of the animal that pulls it | - |
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| thornbill | (noun) any of various South American hummingbirds with a sharp pointed bill | - |
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| thrall | (noun) someone held in bondage | - |
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| (noun) the state of being under the control of another person | Synonyms: bondage, slavery, thraldom, thralldom |
| thrill | (noun) something that causes you to experience a sudden intense feeling or sensation | - |
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| (noun) the swift release of a store of affective force | Synonyms: bang, boot, charge, flush, kick, rush |
| (noun) an almost pleasurable sensation of fright | Synonyms: chill, frisson, quiver, shiver, shudder, tingle |
| thumbstall | (noun) protective covering for an injured thumb | - |
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| till | (noun) a strongbox for holding cash | Synonyms: cashbox, money box |
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| (noun) a treasury for government funds | Synonyms: public treasury, trough |
| (noun) unstratified soil deposited by a glacier; consists of sand and clay and gravel and boulders mixed together | Synonyms: boulder clay |
| toll | (noun) value measured by what must be given or done or undergone to obtain something | Synonyms: cost, price |
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| (noun) the sound of a bell being struck | Synonyms: bell |
| (noun) a fee levied for the use of roads or bridges | - |
| tortoiseshell | (noun) a cat having black and cream-colored and yellowish markings | Synonyms: calico cat, tortoiseshell-cat |
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| (noun) brilliantly colored; larvae feed on nettles | Synonyms: tortoiseshell butterfly |
| (noun) the mottled horny substance of the shell of some turtles | - |
| 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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| treadmill | (noun) a job involving drudgery and confinement | Synonyms: salt mine |
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| (noun) a mill that is powered by men or animals walking on a circular belt or climbing steps | Synonyms: tread-wheel, treadwheel |
| (noun) an exercise device consisting of an endless belt on which a person can walk or jog without changing place | - |
| trill | (noun) a note that alternates rapidly with another note a semitone above it | Synonyms: shake |
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| (noun) the articulation of a consonant (especially the consonant `r') with a rapid flutter of the tongue against the palate or uvula | - |
| troll | (noun) angling by drawing a baited line through the water | Synonyms: trolling |
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| (noun) a fisherman's lure that is used in trolling | - |
| (noun) a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time | Synonyms: round |
| (noun) (Scandinavian folklore) a supernatural creature (either a dwarf or a giant) that is supposed to live in caves or in the mountains | - |
| twill | (noun) a cloth with parallel diagonal lines or ribs | - |
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| (noun) a weave used to produce the effect of parallel diagonal ribs | Synonyms: twill weave |
| uphill | (noun) the upward slope of a hill | - |
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| volleyball | (noun) a game in which two teams hit an inflated ball over a high net using their hands | Synonyms: volley ball, volleyball game |
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| (noun) an inflated ball used in playing volleyball | Synonyms: volley ball |
| wall | (noun) an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure | - |
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| (noun) an embankment built around a space for defensive purposes | Synonyms: bulwark, rampart |
| (noun) a masonry fence (as around an estate or garden) | - |
| (noun) a layer of material that encloses space | - |
| (noun) (anatomy) a layer (a lining or membrane) that encloses a structure | Synonyms: paries |
| (noun) anything that suggests a wall in structure or function or effect | - |
| (noun) a vertical (or almost vertical) smooth rock face (as of a cave or mountain) | - |
| (noun) a difficult or awkward situation | - |
| waterfall | (noun) a steep descent of the water of a river | Synonyms: falls |
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| waybill | (noun) a receipt given by the carrier to the shipper acknowledging receipt of the goods being shipped and specifying the terms of delivery | Synonyms: bill of lading |
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| well | (noun) a deep hole or shaft dug or drilled to obtain water or oil or gas or brine | - |
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| (noun) an enclosed compartment in a ship or plane for holding something as e.g. fish or a plane's landing gear or for protecting something as e.g. a ship's pumps | - |
| (noun) an open shaft through the floors of a building (as for a stairway) | - |
| (noun) a cavity or vessel used to contain liquid | - |
| (noun) an abundant source | Synonyms: fountainhead, wellspring |
| whippoorwill | (noun) American nocturnal goatsucker with grey-and-white plumage | Synonyms: Caprimulgus vociferus |
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| will | (noun) the capability of conscious choice and decision and intention | Synonyms: volition |
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| (noun) a fixed and persistent intent or purpose | - |
| (noun) a legal document declaring a person's wishes regarding the disposal of their property when they die | Synonyms: testament |
| windfall | (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money) | Synonyms: bonanza, boom, bunce, godsend, gold rush, gravy, manna from heaven |
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| (noun) fruit that has fallen from the tree | - |
| windmill | (noun) generator that extracts usable energy from winds | Synonyms: aerogenerator, wind generator |
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| (noun) a mill that is powered by the wind | - |
| windowsill | (noun) the sill of a window; the horizontal member at the bottom of the window frame | - |
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| xanthophyll | (noun) yellow carotenoid pigments in plants and animal fats and egg yolks | Synonyms: lutein, xanthophyl |
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| yell | (noun) a loud utterance; often in protest or opposition | Synonyms: call, cry, outcry, shout, vociferation |
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| (noun) a loud utterance of emotion (especially when inarticulate) | Synonyms: cry |
| zill | (noun) one of a pair of small metallic cymbals worn on the thumb and middle finger; used in belly dancing in rhythm with the dance | - |
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