| aerofoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: airfoil, control surface, surface |
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| airfoil | (noun) a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight | Synonyms: aerofoil, control surface, surface |
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| boil | (noun) the temperature at which a liquid boils at sea level | Synonyms: boiling point |
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| (noun) a painful sore with a hard core filled with pus | Synonyms: furuncle |
| boiler | (noun) sealed vessel where water is converted to steam | Synonyms: steam boiler |
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| (noun) a metal pot for stewing or boiling; usually has a lid | Synonyms: kettle |
| boilerplate | (noun) thick plate iron used in the production of boilers | - |
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| (noun) standard formulations uniformly found in certain types of legal documents or news stories | - |
| boilersuit | (noun) a loose protective coverall or smock worn over ordinary clothing for dirty work | Synonyms: boilers suit, overall |
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| boiling | (noun) cooking in a liquid that has been brought to a boil | Synonyms: simmering, stewing |
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| (noun) the application of heat to change something from a liquid to a gas | - |
| broil | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broiling, grilling |
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| broiler | (noun) an oven or part of a stove used for broiling | - |
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| (noun) flesh of a small young chicken not over 2 1/2 lb suitable for broiling | - |
| broiling | (noun) cooking by direct exposure to radiant heat (as over a fire or under a grill) | Synonyms: broil, grilling |
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| bromoil | (noun) a print made by the bromoil process having soft, paint-like qualities. | - |
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| cinquefoil | (noun) an ornamental carving consisting of five arcs arranged in a circle | - |
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| (noun) any of a numerous plants grown for their five-petaled flowers; abundant in temperate regions; alleged to have medicinal properties | Synonyms: five-finger |
| coil | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: helix, spiral, volute, whorl |
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| (noun) reactor consisting of a spiral of insulated wire that introduces inductance into a circuit | - |
| (noun) tubing that is wound in a spiral | - |
| (noun) a contraceptive device placed inside a woman's womb | - |
| (noun) a transformer that supplies high voltage to spark plugs in a gasoline engine | - |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: curl, curlicue, gyre, ringlet, roll, scroll, whorl |
| counterfoil | (noun) the part of a check that is retained as a record | Synonyms: check stub, stub |
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| despoilation | (noun) the act of stripping and taking by force | Synonyms: despoilment, despoliation, spoil, spoilation, spoliation |
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| despoiler | (noun) someone who takes spoils or plunder (as in war) | Synonyms: freebooter, looter, pillager, plunderer, raider, spoiler |
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| despoilment | (noun) the act of stripping and taking by force | Synonyms: despoilation, despoliation, spoil, spoilation, spoliation |
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| doily | (noun) a small round piece of linen placed under a dish or bowl | Synonyms: doyley, doyly |
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| embroilment | (noun) an intricate and confusing interpersonal or political situation | Synonyms: imbroglio |
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| featherfoil | (noun) a plant of the genus Hottonia | Synonyms: feather-foil |
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| foil | (noun) a light slender flexible sword tipped by a button | - |
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| (noun) a piece of thin and flexible sheet metal | - |
| (noun) picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector | Synonyms: transparency |
| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: hydrofoil |
| (noun) anything that serves by contrast to call attention to another thing's good qualities | Synonyms: enhancer |
| foiling | (noun) an act of hindering someone's plans or efforts | Synonyms: frustration, thwarting |
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| garboil | (noun) a state of commotion and noise and confusion | Synonyms: tumult, tumultuousness, uproar |
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| gumboil | (noun) a boil or abscess on the gums | - |
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| hydrofoil | (noun) a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds | Synonyms: hydroplane |
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| (noun) a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through | Synonyms: foil |
| jejunoileitis | (noun) inflammation of the jejunum and the ileum of the small intestine | - |
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| milfoil | (noun) ubiquitous strong-scented mat-forming Eurasian herb of wasteland, hedgerow or pasture having narrow serrate leaves and small usually white florets; widely naturalized in North America | Synonyms: Achillea millefolium, yarrow |
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| oil | (noun) oil paint containing pigment that is used by an artist | Synonyms: oil color, oil colour |
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| (noun) any of a group of liquid edible fats that are obtained from plants | Synonyms: vegetable oil |
| (noun) a slippery or viscous liquid or liquefiable substance not miscible with water | - |
| (noun) a dark oil consisting mainly of hydrocarbons | Synonyms: crude, crude oil, fossil oil, petroleum, rock oil |
| oilbird | (noun) nocturnal fruit-eating bird of South America that has fatty young yielding an oil that is used instead of butter | Synonyms: guacharo, Steatornis caripensis |
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| oilcan | (noun) a can with a long nozzle to apply oil to machinery | - |
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| oilcloth | (noun) cloth treated on one side with a drying oil or synthetic resin | - |
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| oiler | (noun) a cargo ship designed to carry crude oil in bulk | Synonyms: oil tanker, tank ship, tanker |
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| (noun) a well that yields or has yielded oil | Synonyms: oil well |
| (noun) a worker who oils engines or machinery | - |
| oilfield | (noun) a region rich in petroleum deposits (especially one with producing oil wells) | - |
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| oilfish | (noun) very large deep-water snake mackerel | Synonyms: Ruvettus pretiosus |
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| oiliness | (noun) consisting of or covered with oil | Synonyms: greasiness, oleaginousness |
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| (noun) smug self-serving earnestness | Synonyms: fulsomeness, oleaginousness, smarminess, unction, unctuousness |
| oilman | (noun) a worker who produces or sells petroleum | - |
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| (noun) a person who owns or operates oil wells | - |
| oilpaper | (noun) paper that has been made translucent and waterproof by soaking in oil | - |
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| oilrig | (noun) rig used in drilling for oil or gas | Synonyms: drill rig, drilling rig, oil rig |
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| oilseed | (noun) any of several seeds that yield oil | Synonyms: oil-rich seed |
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| oilskin | (noun) a macintosh made from cotton fabric treated with oil and pigment to make it waterproof | Synonyms: slicker |
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| oilstone | (noun) a whetstone for use with oil | - |
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| oilstove | (noun) heater that burns oil (as kerosine) for heating or cooking | Synonyms: kerosene heater, kerosine heater, oil heater |
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| poilu | (noun) thick stew made of rice and chicken and small game; southern U.S. | Synonyms: chicken purloo, purloo |
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| (noun) a French soldier (especially in World War I) | - |
| potboiler | (noun) a literary composition of poor quality that was written quickly to make money (to boil the pot) | - |
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| recoil | (noun) a movement back from an impact | Synonyms: backlash, rebound, repercussion |
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| (noun) the backward jerk of a gun when it is fired | Synonyms: kick |
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| soil | (noun) the geographical area under the jurisdiction of a sovereign state | Synonyms: territory |
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| (noun) material in the top layer of the surface of the earth in which plants can grow (especially with reference to its quality or use) | Synonyms: ground, land |
| (noun) anything regarded as making something unclean | Synonyms: dirt, filth, grease, grime, grunge, stain |
| (noun) the part of the earth's surface consisting of humus and disintegrated rock | Synonyms: dirt |
| soiling | (noun) the act of soiling something | Synonyms: dirtying, soilure |
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| soilure | (noun) the act of soiling something | Synonyms: dirtying, soiling |
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| spoil | (noun) the act of stripping and taking by force | Synonyms: despoilation, despoilment, despoliation, spoilation, spoliation |
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| (noun) the act of spoiling something by causing damage to it | Synonyms: spoilage, spoiling |
| (noun) (usually plural) valuables taken by violence (especially in war) | - |
| spoilable | (noun) food that will decay rapidly if not refrigerated | Synonyms: perishable |
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| spoilage | (noun) the act of spoiling something by causing damage to it | Synonyms: spoil, spoiling |
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| (noun) the process of becoming spoiled | Synonyms: spoiling |
| (noun) the amount that has spoiled | - |
| spoilation | (noun) the act of stripping and taking by force | Synonyms: despoilation, despoilment, despoliation, spoil, spoliation |
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| spoiler | (noun) a hinged airfoil on the upper surface of an aircraft wing that is raised to reduce lift and increase drag | - |
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| (noun) an airfoil mounted on the rear of a car to reduce lift at high speeds | - |
| (noun) someone who takes spoils or plunder (as in war) | Synonyms: despoiler, freebooter, looter, pillager, plunderer, raider |
| (noun) a candidate with no chance of winning but who may draw enough votes to prevent one of the leading candidates from winning | - |
| (noun) someone who pampers or spoils by excessive indulgence | Synonyms: coddler, mollycoddler, pamperer |
| spoiling | (noun) the act of spoiling something by causing damage to it | Synonyms: spoil, spoilage |
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| (noun) the process of becoming spoiled | Synonyms: spoilage |
| spoilsport | (noun) someone who spoils the pleasure of others | Synonyms: killjoy, party pooper, wet blanket |
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| subsoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: undersoil |
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| tinfoil | (noun) foil made of tin or an alloy of tin and lead | Synonyms: tin foil |
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| toil | (noun) productive work (especially physical work done for wages) | Synonyms: labor, labour |
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| toiler | (noun) one who works strenuously | - |
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| toilet | (noun) the act of dressing and preparing yourself | Synonyms: toilette |
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| (noun) a room or building equipped with one or more toilets | Synonyms: bathroom, can, john, lav, lavatory, privy |
| (noun) a plumbing fixture for defecation and urination | Synonyms: can, commode, crapper, pot, potty, stool, throne |
| (noun) misfortune resulting in lost effort or money | Synonyms: gutter, sewer |
| toiletry | (noun) artifacts used in making your toilet (washing and taking care of your body) | Synonyms: toilet articles |
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| toilette | (noun) the act of dressing and preparing yourself | Synonyms: toilet |
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| toilsomeness | (noun) the quality of requiring extended effort | Synonyms: laboriousness, operoseness |
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| topsoil | (noun) the layer of soil on the surface | Synonyms: surface soil |
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| trefoil | (noun) an architectural ornament in the form of three arcs arranged in a circle | - |
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| (noun) a plant of the genus Trifolium | Synonyms: clover |
| (noun) any of several Old World herbs of the genus Medicago having small flowers and trifoliate compound leaves | Synonyms: medic, medick |
| turmoil | (noun) disturbance usually in protest | Synonyms: agitation, excitement, hullabaloo, upheaval |
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| (noun) violent agitation | Synonyms: tumult |
| (noun) a violent disturbance | Synonyms: convulsion, upheaval |
| undersoil | (noun) the layer of soil between the topsoil and bedrock | Synonyms: subsoil |
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| voile | (noun) a light semitransparent fabric | - |
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