| peshmerga | (noun) a member of a Kurdish guerilla organization that fights for a free Kurdish state | - |
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| polymer | (noun) a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers | - |
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| polymerase | (noun) an enzyme that catalyzes the formation of new DNA and RNA from an existing strand of DNA or RNA | - |
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| polymerisation | (noun) a chemical process that combines several monomers to form a polymer or polymeric compound | Synonyms: polymerization |
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| polymerization | (noun) a chemical process that combines several monomers to form a polymer or polymeric compound | Synonyms: polymerisation |
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| primer | (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fuse, fusee, fuze, fuzee, priming |
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| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer coat, priming, priming coat, undercoat |
| (noun) an introductory textbook | - |
| 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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| reamer | (noun) a drill that is used to shape or enlarge holes | - |
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| (noun) a squeezer with a conical ridged center that is used for squeezing juice from citrus fruit | Synonyms: juice reamer, juicer |
| redeemer | (noun) someone who redeems or buys back (promissory notes or merchandise or commercial paper etc.) | - |
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| reformer | (noun) an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel | - |
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| (noun) a disputant who advocates reform | Synonyms: crusader, meliorist, reformist, social reformer |
| rhymer | (noun) a writer who composes rhymes; a maker of poor verses (usually used as terms of contempt for minor or inferior poets) | Synonyms: poetiser, poetizer, rhymester, versifier |
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| roamer | (noun) someone who leads a wandering unsettled life | Synonyms: bird of passage, rover, wanderer |
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| roomer | (noun) a tenant in someone's house | Synonyms: boarder, lodger |
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| rummer | (noun) a large drinking glass (ovoid bowl on a stem) for drinking toasts | - |
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| sarcomere | (noun) one of the segments into which a myofibril is divided | - |
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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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| schemer | (noun) a planner who draws up a personal scheme of action | Synonyms: plotter |
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| screamer | (noun) a very hard hit ball | Synonyms: scorcher |
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| (noun) gooselike aquatic bird of South America having a harsh trumpeting call | - |
| (noun) a sensational newspaper headline | - |
| (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, bellower, roarer, screecher, shouter, yeller |
| 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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| somersault | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersaulting, somerset, summersault, summerset |
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| somersaulting | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somerset, summersault, summerset |
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| somerset | (noun) an acrobatic feat in which the feet roll over the head (either forward or backward) and return | Synonyms: flip, somersault, somersaulting, summersault, summerset |
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| spammer | (noun) someone who sends unwanted email (often in bulk) | - |
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| squirmer | (noun) one who can't stay still (especially a child) | Synonyms: wiggler, wriggler |
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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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| steamer | (noun) an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe | Synonyms: long-neck clam, Mya arenaria, soft-shell clam, steamer clam |
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| (noun) a ship powered by one or more steam engines | Synonyms: steamship |
| (noun) a cooking utensil that can be used to cook food by steaming it | - |
| (noun) a clam that is usually steamed in the shell | Synonyms: long-neck clam, soft-shell clam, steamer clam |
| 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 |
| stereoisomer | (noun) any of a group of isomers in which atoms are linked in the same order but differ in their spatial arrangement. | - |
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| streamer | (noun) long strip of cloth or paper used for decoration or advertising | Synonyms: banner |
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| (noun) a long flag; often tapering | Synonyms: pennant, pennon, waft |
| (noun) a newspaper headline that runs across the full page | Synonyms: banner |
| (noun) light that streams | - |
| submergence | (noun) sinking until covered completely with water | Synonyms: immersion, submerging, submersion |
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| submerging | (noun) sinking until covered completely with water | Synonyms: immersion, submergence, submersion |
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| submersible | (noun) a warship designed to operate under water | Synonyms: submersible warship |
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| (noun) an apparatus intended for use under water | - |
| submersion | (noun) the act of wetting something by submerging it | Synonyms: dousing, ducking, immersion |
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| (noun) sinking until covered completely with water | Synonyms: immersion, submergence, submerging |
| 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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| supernumerary | (noun) a minor actor in crowd scenes | Synonyms: extra, spear carrier |
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| (noun) a person serving no apparent function | - |
| 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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| tamer | (noun) an animal trainer who tames wild animals | - |
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| taxonomer | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomist |
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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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| telomerase | (noun) an enzyme in eukaryotic cells that can add telomeres to the ends of chromosomes after they divide | - |
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| telomere | (noun) either (free) end of a eukaryotic chromosome | - |
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| temerity | (noun) fearless daring | Synonyms: audaciousness, audacity |
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| termer | (noun) a person who serves a specified term | - |
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| thimerosal | (noun) a light-colored crystalline powder (trade name Merthiolate) used as a surgical antiseptic | Synonyms: Merthiolate, sodium ethylmercurithiosalicylate |
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| timer | (noun) a timepiece that measures a time interval and signals its end | - |
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| (noun) a regulator that activates or deactivates a mechanism at set times | - |
| (noun) (sports) an official who keeps track of the time elapsed | Synonyms: timekeeper |
| transformer | (noun) an electrical device by which alternating current of one voltage is changed to another voltage | - |
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| trimer | (noun) a polymer (or a molecule of a polymer) consisting of three identical monomers | - |
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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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| turmeric | (noun) ground dried rhizome of the turmeric plant used as seasoning | - |
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| (noun) widely cultivated tropical plant of India having yellow flowers and a large aromatic deep yellow rhizome; source of a condiment and a yellow dye | Synonyms: Curcuma domestica, Curcuma longa |
| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| unmercifulness | (noun) inhumaneness evidenced by an unwillingness to be kind or forgiving | Synonyms: mercilessness |
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| vomer | (noun) thin trapezoidal bone of the skull forming the posterior and inferior parts of the nasal septum | - |
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| warmer | (noun) device that heats water or supplies warmth to a room | Synonyms: heater |
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| weisenheimer | (noun) an upstart who makes conceited, sardonic, insolent comments | Synonyms: smart aleck, wise guy, wiseacre, wisenheimer |
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| welcomer | (noun) a person who greets | Synonyms: greeter, saluter |
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| windjammer | (noun) a large sailing ship | - |
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| wisenheimer | (noun) an upstart who makes conceited, sardonic, insolent comments | Synonyms: smart aleck, weisenheimer, wise guy, wiseacre |
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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 |