| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| bummer | (noun) an experience that is irritating or frustrating or disappointing | - |
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| (noun) a bad reaction to a hallucinogenic drug | - |
| clawhammer | (noun) a hammer with a cleft at one end for pulling nails | Synonyms: carpenter's hammer, claw hammer |
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| commerce | (noun) transactions (sales and purchases) having the objective of supplying commodities (goods and services) | Synonyms: commercialism, mercantilism |
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| (noun) social exchange, especially of opinions, attitudes, etc. | - |
| commercial | (noun) a commercially sponsored ad on radio or television | Synonyms: commercial message |
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| commercialisation | (noun) the act of commercializing something; involving something in commerce | Synonyms: commercialization |
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| commercialism | (noun) transactions (sales and purchases) having the objective of supplying commodities (goods and services) | Synonyms: commerce, mercantilism |
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| commercialization | (noun) the act of commercializing something; involving something in commerce | Synonyms: commercialisation |
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| crammer | (noun) a textbook designed for cramming | - |
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| (noun) a special school where students are crammed | - |
| (noun) a student who crams | - |
| (noun) a teacher who is paid to cram students for examinations | - |
| cummerbund | (noun) a broad pleated sash worn as formal dress with a tuxedo | - |
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| dimmer | (noun) a rheostat that varies the current through an electric light in order to control the level of illumination | - |
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| drummer | (noun) someone who plays a drum | - |
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| emmer | (noun) hard red wheat grown especially in Russia and Germany; in United States as stock feed | Synonyms: starch wheat, Triticum dicoccum, two-grain spelt |
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| flummery | (noun) meaningless ceremonies and flattery | Synonyms: mummery |
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| (noun) a bland custard or pudding especially of oatmeal | - |
| glimmer | (noun) a slight suggestion or vague understanding | Synonyms: glimmering, inkling, intimation |
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| (noun) a flash of light (especially reflected light) | Synonyms: gleam, gleaming |
| glimmering | (noun) a slight suggestion or vague understanding | Synonyms: glimmer, inkling, intimation |
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| hammer | (noun) the act of pounding (delivering repeated heavy blows) | Synonyms: hammering, pound, pounding |
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| (noun) a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking | - |
| (noun) a power tool for drilling rocks | Synonyms: power hammer |
| (noun) a striker that is covered in felt and that causes the piano strings to vibrate | - |
| (noun) a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc. | Synonyms: mallet |
| (noun) the part of a gunlock that strikes the percussion cap when the trigger is pulled | Synonyms: cock |
| (noun) a heavy metal sphere attached to a flexible wire; used in the hammer throw | - |
| (noun) the ossicle attached to the eardrum | Synonyms: malleus |
| hammerhead | (noun) medium-sized live-bearing shark with eyes at either end of a flattened hammer-shaped head; worldwide in warm waters; can be dangerous | Synonyms: hammerhead shark |
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| (noun) the striking part of a hammer | - |
| (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dumbass, dunce, dunderhead, fuckhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
| hammering | (noun) the act of pounding (delivering repeated heavy blows) | Synonyms: hammer, pound, pounding |
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| hammerlock | (noun) a wrestling hold in which the opponent's arm is twisted up behind his back | - |
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| hammertoe | (noun) a deformed toe which is bent in a clawlike arch | - |
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| hummer | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: bullet, fastball, heater, smoke |
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| (noun) a singer who produces a tune without opening the lips or forming words | - |
| immersion | (noun) a form of baptism in which part or all of a person's body is submerged | - |
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| (noun) the act of wetting something by submerging it | Synonyms: dousing, ducking, submersion |
| (noun) complete attention; intense mental effort | Synonyms: absorption, concentration, engrossment |
| (noun) sinking until covered completely with water | Synonyms: submergence, submerging, submersion |
| (noun) (astronomy) the disappearance of a celestial body prior to an eclipse | Synonyms: ingress |
| jackhammer | (noun) a hammer driven by compressed air | Synonyms: air hammer, pneumatic hammer |
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| jammer | (noun) a transmitter used to broadcast electronic jamming | - |
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| katzenjammer | (noun) loud confused noise from many sources | Synonyms: brouhaha, hubbub, uproar |
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| (noun) disagreeable aftereffects from the use of drugs (especially alcohol) | Synonyms: hangover |
| lammergeier | (noun) the largest Eurasian bird of prey; having black feathers hanging around the bill | Synonyms: bearded vulture, Gypaetus barbatus, lammergeyer |
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| lammergeyer | (noun) the largest Eurasian bird of prey; having black feathers hanging around the bill | Synonyms: bearded vulture, Gypaetus barbatus, lammergeier |
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| midsummer | (noun) June 21, when the sun is at its northernmost point | Synonyms: June 21, summer solstice |
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| mummer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, pantomimer, pantomimist |
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| mummery | (noun) meaningless ceremonies and flattery | Synonyms: flummery |
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| programmer | (noun) a person who designs and writes and tests computer programs | Synonyms: coder, computer programmer, software engineer |
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| rammer | (noun) a tool for driving something with force | - |
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| rummer | (noun) a large drinking glass (ovoid bowl on a stem) for drinking toasts | - |
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| scammer | (noun) a person who swindles you by means of deception or fraud | Synonyms: chiseler, chiseller, defrauder, gouger, grifter, swindler |
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| shammer | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, pseudo, role player, sham |
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| (noun) someone shirking their duty by feigning illness or incapacity | Synonyms: malingerer, skulker |
| shimmer | (noun) a weak and tremulous light | Synonyms: play |
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| simmer | (noun) temperature just below the boiling point | - |
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| simmering | (noun) cooking in a liquid that has been brought to a boil | Synonyms: boiling, stewing |
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| skimmer | (noun) gull-like seabird that flies along the surface of the water with an elongated lower mandible immersed to skim out food | - |
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| (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, leghorn, Panama, Panama hat, sailor, straw hat |
| (noun) a cooking utensil used to skim fat from the surface of liquids | - |
| (noun) a rapid superficial reader | - |
| slammer | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jail, jailhouse, pokey, poky |
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| (noun) a person who closes things violently | - |
| sledgehammer | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: maul, sledge |
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| spammer | (noun) someone who sends unwanted email (often in bulk) | - |
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| stammer | (noun) a speech disorder involving hesitations and involuntary repetitions of certain sounds | Synonyms: stutter |
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| stammerer | (noun) someone who speaks with involuntary pauses and repetitions | Synonyms: stutterer |
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| stemmer | (noun) a device for removing stems from fruit (as from grapes or apples) | - |
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| (noun) a miner's tamping bar for ramming packing in over a blasting charge | - |
| (noun) an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem | Synonyms: stemming algorithm |
| (noun) a worker who makes or applies stems for artificial flowers | - |
| (noun) a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books | Synonyms: sprigger, stripper |
| summer | (noun) the warmest season of the year; in the Northern Hemisphere it extends from the summer solstice to the autumnal equinox | Synonyms: summertime |
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| (noun) the period of finest development, happiness, or beauty | - |
| summercater | (noun) (Maine colloquial) a temporary summer resident of Maine | Synonyms: sport |
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| summercaters | (noun) (Maine colloquial) temporary summer residents of coastal Maine | - |
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| summerhouse | (noun) a small roofed building affording shade and rest | Synonyms: gazebo |
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| summersault | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somersaulting, somerset, summerset |
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| summerset | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somersaulting, somerset, summersault |
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| summertime | (noun) the warmest season of the year; in the Northern Hemisphere it extends from the summer solstice to the autumnal equinox | Synonyms: summer |
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| swimmer | (noun) a trained athlete who participates in swimming meets | - |
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| (noun) a person who travels through the water by swimming | Synonyms: bather, natator |
| swimmeret | (noun) one of the paired abdominal appendages of certain aquatic crustaceans that function primarily for carrying the eggs in females and are usually adapted for swimming | Synonyms: pleopod |
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| telecommerce | (noun) the use of the telephone as an interactive medium for promotion and sales | Synonyms: telemarketing, teleselling |
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| trimmer | (noun) joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc. | Synonyms: trimmer joist |
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| (noun) capacitor having variable capacitance; used for making fine adjustments | Synonyms: trimming capacitor |
| (noun) a machine that trims timber | - |
| (noun) a worker who thins out and trims trees and shrubs | Synonyms: pruner |
| triphammer | (noun) a massive power hammer; raised by a cam until released to fall under gravity | - |
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| windjammer | (noun) a large sailing ship | - |
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| yellowhammer | (noun) European bunting the male being bright yellow | Synonyms: Emberiza citrinella, yellow bunting |
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| (noun) large flicker of eastern North America with a red neck and yellow undersurface to wings and tail | Synonyms: Colaptes auratus, yellow-shafted flicker |