| amphitheater | (noun) an oval large stadium with tiers of seats; an arena in which contests and spectacles are held | Synonyms: amphitheatre, coliseum |
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| (noun) a sloping gallery with seats for spectators (as in an operating room or theater) | Synonyms: amphitheatre |
| anteater | (noun) any of several tropical American mammals of the family Myrmecophagidae which lack teeth and feed on ants and termites | Synonyms: New World anteater |
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| (noun) nocturnal burrowing mammal of the grasslands of Africa that feeds on termites; sole extant representative of the order Tubulidentata | Synonyms: aardvark, ant bear, Orycteropus afer |
| (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to Australia | Synonyms: echidna, spiny anteater |
| (noun) a burrowing monotreme mammal covered with spines and having a long snout and claws for hunting ants and termites; native to New Guinea | Synonyms: echidna, spiny anteater |
| (noun) toothless mammal of southern Africa and Asia having a body covered with horny scales and a long snout for feeding on ants and termites | Synonyms: pangolin, scaly anteater |
| (noun) small Australian marsupial having long snout and strong claws for feeding on termites; nearly extinct | Synonyms: banded anteater, Myrmecobius fasciatus, numbat |
| backwater | (noun) a place or condition in which no development or progress is occurring | - |
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| (noun) a body of water that was created by a flood or tide or by being held or forced back by a dam | - |
| barrater | (noun) someone guilty of barratry | Synonyms: barrator |
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| beater | (noun) an implement for beating | - |
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| (noun) a worker who rouses wild game from under cover for a hunter | - |
| beefeater | (noun) officer in the (ceremonial) bodyguard of the British monarch | Synonyms: yeoman, yeoman of the guard |
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| bilgewater | (noun) pretentious or silly talk or writing | Synonyms: baloney, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tommyrot, tosh, twaddle |
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| blackwater | (noun) any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells | - |
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| bloater | (noun) large fatty herring lightly salted and briefly smoked | - |
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| boater | (noun) a stiff hat made of straw with a flat crown | Synonyms: leghorn, Panama, Panama hat, sailor, skimmer, straw hat |
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| (noun) someone who drives or rides in a boat | Synonyms: boatman, waterman |
| breakwater | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: bulwark, groin, groyne, jetty, mole, seawall |
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| celebrater | (noun) a person who is celebrating | Synonyms: celebrant, celebrator |
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| cheater | (noun) someone who leads you to believe something that is not true | Synonyms: beguiler, cheat, deceiver, slicker, trickster |
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| crater | (noun) a bowl-shaped depression formed by the impact of a meteorite or bomb | - |
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| (noun) a bowl-shaped geological formation at the top of a volcano | Synonyms: volcanic crater |
| debater | (noun) someone who engages in debate | Synonyms: arguer |
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| dilater | (noun) a surgical instrument that is used to dilate or distend an opening or an organ | Synonyms: dilator |
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| dishwater | (noun) water in which dishes and cooking utensils are washed | - |
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| drumbeater | (noun) a fervent and even militant proponent of something | Synonyms: partisan, zealot |
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| eater | (noun) any green goods that are good to eat | - |
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| (noun) someone who consumes food for nourishment | Synonyms: feeder |
| eggbeater | (noun) a mixer for beating eggs or whipping cream | Synonyms: eggwhisk |
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| (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: chopper, helicopter, whirlybird |
| elater | (noun) any of various widely distributed beetles | Synonyms: elaterid, elaterid beetle |
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| electroplater | (noun) a plater who uses electrolysis | - |
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| figeater | (noun) large greenish June beetle of southern United States | Synonyms: green June beetle |
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| firewater | (noun) any strong spirits (such as strong whisky or rum) | - |
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| floater | (noun) an insurance policy covering loss of movable property (e.g. jewelry) regardless of its location | Synonyms: floating policy |
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| (noun) an object that floats or is capable of floating | - |
| (noun) a swimmer who floats in the water | - |
| (noun) a wanderer who has no established residence or visible means of support | Synonyms: clochard, drifter, vagabond, vagrant |
| (noun) a voter who votes illegally at different polling places in the same election | - |
| (noun) an employee who is reassigned from job to job as needed | - |
| (noun) a debt instrument with a variable interest rate tied to some other interest rate (e.g. the rate paid by T-bills) | - |
| (noun) spots before the eyes caused by opaque cell fragments in the vitreous humor and lens | Synonyms: musca volitans, muscae volitantes, spots |
| freshwater | (noun) water that is not salty | Synonyms: fresh water |
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| goldbeater | (noun) an artisan who beats gold into gold leaf | Synonyms: gold-beater |
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| grater | (noun) utensil with sharp perforations for shredding foods (as vegetables or cheese) | - |
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| hater | (noun) a person who hates | - |
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| headwater | (noun) the source of a river | - |
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| heater | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: bullet, fastball, hummer, smoke |
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| (noun) device that heats water or supplies warmth to a room | Synonyms: warmer |
| hesitater | (noun) one who hesitates (usually out of fear) | Synonyms: hesitator, vacillator, waverer |
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| highwater | (noun) the tide when the water is highest | Synonyms: high tide, high water |
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| idolater | (noun) a person who worships idols | Synonyms: idol worshiper, idoliser, idolizer |
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| inflater | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflator |
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| limewater | (noun) solution of calcium hydroxide in water used as an antacid | - |
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| locater | (noun) a person who fixes the boundaries of land claims | Synonyms: locator |
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| maltreater | (noun) someone who abuses | Synonyms: abuser |
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| mater | (noun) an informal use of the Latin word for mother; sometimes used by British schoolboys or used facetiously | - |
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| meltwater | (noun) melted snow or ice | - |
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| pater | (noun) an informal use of the Latin word for father; sometimes used by British schoolboys or used facetiously | - |
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| plater | (noun) a skilled worker who coats articles with a film of metal (usually silver or gold) | - |
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| prater | (noun) an obnoxious and foolish and loquacious talker | Synonyms: babbler, chatterbox, chatterer, magpie, spouter |
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| rainwater | (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rain |
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| repeater | (noun) a firearm that can fire several rounds without reloading | Synonyms: repeating firearm |
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| (noun) (electronics) electronic device that amplifies a signal before transmitting it again | - |
| (noun) a person who repeats | - |
| (noun) someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior) | Synonyms: habitual criminal, recidivist |
| saltwater | (noun) water containing salts | Synonyms: brine, seawater |
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| seawater | (noun) water containing salts | Synonyms: brine, saltwater |
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| shearwater | (noun) long-winged oceanic bird that in flight skims close to the waves | - |
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| skater | (noun) someone who skates | - |
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| slater | (noun) any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats | Synonyms: wood louse, woodlouse |
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| speedskater | (noun) an ice-skater who races competitively; usually around an oval course | Synonyms: speed skater |
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| stater | (noun) a resident of a particular state or group of states | - |
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| (noun) any of the various silver or gold coins of ancient Greece | - |
| summercater | (noun) (Maine colloquial) a temporary summer resident of Maine | Synonyms: sport |
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| sweater | (noun) a crocheted or knitted garment covering the upper part of the body | Synonyms: jumper |
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| (noun) a person who perspires | Synonyms: perspirer |
| tailgater | (noun) a driver who follows too closely behind another motor vehicle | - |
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| tater | (noun) an edible tuber native to South America; a staple food of Ireland | Synonyms: Irish potato, murphy, potato, spud, white potato |
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| theater | (noun) a building where theatrical performances or motion-picture shows can be presented | Synonyms: house, theatre |
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| (noun) the art of writing and producing plays | Synonyms: dramatic art, dramatics, dramaturgy, theatre |
| (noun) a region in which active military operations are in progress | Synonyms: field, field of operations, theater of operations, theatre, theatre of operations |
| tidewater | (noun) low-lying coastal land drained by tidal streams | - |
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| treater | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiant, negotiator |
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| wastewater | (noun) water mixed with waste matter | Synonyms: effluent, sewer water |
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| water | (noun) a facility that provides a source of water | Synonyms: water supply, water system |
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| (noun) a liquid necessary for the life of most animals and plants | - |
| (noun) the part of the earth's surface covered with water (such as a river or lake or ocean) | Synonyms: body of water |
| (noun) binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent | Synonyms: H2O |
| (noun) liquid excretory product | Synonyms: pee, piddle, piss, urine, weewee |
| (noun) once thought to be one of four elements composing the universe (Empedocles), associated with the humour phlegm | - |
| whitewater | (noun) frothy water as in rapids or waterfalls | Synonyms: white water |
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| windcheater | (noun) a kind of heavy jacket | Synonyms: anorak, parka, windbreaker |
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