| fieldworker | (noun) a researcher who works in the field | - |
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| filmmaker | (noun) a producer of motion pictures | Synonyms: film maker, film producer, movie maker |
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| firecracker | (noun) firework consisting of a small explosive charge and fuse in a heavy paper casing | Synonyms: banger, cracker |
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| flanker | (noun) a soldier who is a member of a detachment assigned to guard the flanks of a military formation | - |
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| (noun) a back stationed wide of the scrimmage line; used as a pass receiver | Synonyms: flanker back |
| flicker | (noun) the act of moving back and forth | Synonyms: flutter, waver |
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| (noun) North American woodpecker | - |
| (noun) a momentary flash of light | Synonyms: glint, spark |
| (verb) move back and forth very rapidly | Synonyms: flitter, flutter, quiver, waver |
| (verb) flash intermittently | Synonyms: flick |
| (verb) shine unsteadily | Synonyms: flick |
| flickering | (adjective) shining unsteadily | Synonyms: aflicker |
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| flickertail | (noun) of sagebrush and grassland areas of western United States and Canada | Synonyms: Citellus richardsoni, Richardson ground squirrel |
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| floorwalker | (noun) an employee of a retail store who supervises sales personnel and helps with customer problems | Synonyms: shopwalker |
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| footlocker | (noun) a trunk for storing personal possessions; usually kept at the foot of a bed (as in a barracks) | Synonyms: locker |
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| freethinker | (noun) a person who rejects religion | - |
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| fucker | (noun) a stupid despised man | - |
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| garmentmaker | (noun) a person who makes garments | Synonyms: dressmaker, garment-worker, garment worker |
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| gawker | (noun) a spectator who stares stupidly without intelligent awareness | - |
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| gimcrackery | (noun) ornamental objects of no great value | Synonyms: falderol, folderal, frill, gimcrack, nonsense, trumpery |
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| glassmaker | (noun) someone who makes glass | - |
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| glassworker | (noun) someone who cuts flat glass to size | Synonyms: glass-cutter, glass cutter, glazer, glazier |
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| goatsucker | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: caprimulgid, nightjar |
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| goldworker | (noun) an artisan who makes jewelry and other objects out of gold | Synonyms: gold-worker, goldsmith |
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| groundbreaker | (noun) someone who helps to open up a new line of research or technology or art | Synonyms: innovator, pioneer, trailblazer |
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| guestworker | (noun) a person with temporary permission to work in another country | Synonyms: guest worker |
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| hacker | (noun) one who works hard at boring tasks | Synonyms: drudge, hack |
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| (noun) a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm | - |
| (noun) someone who plays golf poorly | - |
| handkerchief | (noun) a square piece of cloth used for wiping the eyes or nose or as a costume accessory | Synonyms: hankey, hankie, hanky |
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| hanker | (verb) desire strongly or persistently | Synonyms: long, yearn |
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| hankering | (noun) a yearning for something or to do something | Synonyms: yen |
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| hatmaker | (noun) someone who makes and sells hats | Synonyms: hatter, milliner, modiste |
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| hawker | (noun) someone who travels about selling his wares (as on the streets or at carnivals) | Synonyms: packman, peddler, pedlar, pitchman |
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| (noun) a person who breeds and trains hawks and who follows the sport of falconry | Synonyms: falconer |
| haymaker | (noun) a hard punch that renders the opponent unable to continue boxing | Synonyms: knockout punch, KO punch, Sunday punch |
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| (noun) a farm machine that treats hay to cause more rapid and even drying | Synonyms: hay conditioner |
| heartbreaker | (noun) a narrow defeat or a defeat at the last minute | - |
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| (noun) a charming person who is irresponsible in emotional relationships | - |
| highjacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highwayman, hijacker, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: hijacker |
| hijacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highjacker, highwayman, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: highjacker |
| hiker | (noun) a foot traveler; someone who goes on an extended walk (for pleasure) | Synonyms: tramp, tramper |
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| hitchhiker | (noun) a person who travels by getting free rides from passing vehicles | - |
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| hogchoker | (noun) useless as food; in coastal streams from Maine to Texas and Panama | Synonyms: Trinectes maculatus |
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| holidaymaker | (noun) someone who travels for pleasure | Synonyms: tourer, tourist |
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| homemaker | (noun) a wife who manages a household while her husband earns the family income | Synonyms: housewife, lady of the house, woman of the house |
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| honeysucker | (noun) Australasian bird with tongue and bill adapted for extracting nectar | Synonyms: honey eater |
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| honker | (noun) common greyish-brown wild goose of North America with a loud, trumpeting call | Synonyms: Branta canadensis, Canada goose, Canadian goose |
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| (noun) informal terms for the nose | Synonyms: beak, hooter, nozzle, schnoz, schnozzle, snoot, snout |
| (noun) a driver who causes his car's horn to make a loud honking sound | - |
| hooker | (noun) a prostitute who attracts customers by walking the streets | Synonyms: floozie, floozy, hustler, slattern, street girl, streetwalker |
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| (noun) (rugby) the player in the middle of the front row of the scrum who tries to capture the ball with the foot | - |
| (noun) a golfer whose shots typically curve left (for right-handed golfers) | - |
| housebreaker | (noun) a burglar who unlawfully breaks into and enters another person's house | Synonyms: cat burglar |
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| (noun) a wrecker of houses | Synonyms: housewrecker |
| housewrecker | (noun) a wrecker of houses | Synonyms: housebreaker |
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| hunker | (verb) sit on one's heels | Synonyms: crouch, hunker down, scrunch, scrunch up, squat |
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| icebreaker | (noun) a beginning that relaxes a tense or formal atmosphere | - |
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| (noun) a ship with a reinforced bow to break up ice and keep channels open for navigation | Synonyms: iceboat |
| iridokeratitis | (noun) inflammation of the iris and cornea of the eye | - |
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| ironworker | (noun) a person who makes articles of iron | - |
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| jawbreaker | (noun) a word that is hard to pronounce | - |
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| (noun) a large round hard candy | - |
| jaywalker | (noun) a reckless pedestrian who crosses a street illegally | - |
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| jerker | (noun) someone who gives a strong sudden pull | Synonyms: yanker |
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| joker | (noun) a playing card that is usually printed with a picture of a jester | - |
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| (noun) an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent | - |
| (noun) a person who enjoys telling or playing jokes | Synonyms: jokester |
| (noun) a person who does something thoughtless or annoying | Synonyms: turkey |
| keratalgia | (noun) pain in the cornea | - |
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| keratectasia | (noun) abnormal bulging of the cornea of the eye | - |
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| keratin | (noun) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves | Synonyms: ceratin |
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| keratinisation | (noun) organic process by which keratin is deposited in cells and the cells become horny (as in nails and hair) | Synonyms: keratinization |
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| keratinise | (verb) become horny and impregnated with keratin | Synonyms: keratinize |
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| (verb) convert into keratin | Synonyms: keratinize |
| keratinization | (noun) organic process by which keratin is deposited in cells and the cells become horny (as in nails and hair) | Synonyms: keratinisation |
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| keratinize | (verb) become horny and impregnated with keratin | Synonyms: keratinise |
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| (verb) convert into keratin | Synonyms: keratinise |
| keratitis | (noun) inflammation of the cornea causing watery painful eyes and blurred vision | - |
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| keratoacanthoma | (noun) skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar | - |
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| keratocele | (noun) hernia of the cornea | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| keratoiritis | (noun) inflammation of the cornea and the iris of the eye | - |
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| keratomalacia | (noun) softening and drying and ulceration of the cornea resulting from vitamin A deficiency; symptom of cystic fibrosis or sprue | - |
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| keratomycosis | (noun) fungal infection of the cornea | - |
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| keratonosis | (noun) any abnormal condition of the outer skin (epidermis) | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| keratoplasty | (noun) a surgical procedure in which part or all of a damaged or diseased cornea is replaced by healthy corneal tissue from a donor | Synonyms: corneal graft, corneal transplant |
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| keratoscleritis | (noun) inflammation of the cornea and sclera of the eye | - |
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| keratoscope | (noun) medical instrument to examine the cornea in order to detect irregularities in its anterior surface | - |
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| keratoscopy | (noun) examination of the cornea with a keratoscope to detect irregularities in its anterior surface | - |
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| keratosis | (noun) a skin condition marked by an overgrowth of layers of horny skin | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| kerb | (noun) an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter) | Synonyms: curb, curbing |
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| kerbstone | (noun) a paving stone forming part of a curb | Synonyms: curbstone |
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| kerchief | (noun) a square scarf that is folded into a triangle and worn over the head or about the neck | - |
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| kerfuffle | (noun) a disorderly outburst or tumult | Synonyms: commotion, disruption, disturbance, flutter, hoo-ha, hoo-hah, hurly burly, to-do |
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| kerion | (noun) ringworm infection of the hair follicles of the scalp and beard that usually results in a swelling that is covered with pustules and oozes fluid | - |
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| kerite | (noun) a compound in which tar or asphalt combined with animal or vegetable oils is vulcanized by sulphur, the product closely resembling rubber. | - |
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| kern | (noun) the part of a metal type that projects beyond its body | - |
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| (verb) remove a portion of space between (adjacent letters) | - |
| (verb) furnish with a kern | - |
| kernel | (noun) the choicest or most essential or most vital part of some idea or experience | Synonyms: center, centre, core, essence, gist, heart, heart and soul, inwardness, marrow, meat, nitty-gritty, nub, pith, substance, sum |
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| (noun) a single whole grain of a cereal | - |
| (noun) the inner and usually edible part of a seed or grain or nut or fruit stone | Synonyms: meat |
| kernicterus | (noun) an abnormal accumulation of bile pigment in the brain and other nerve tissue; causes yellow staining and tissue damage | - |
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| kernite | (noun) a light soft mineral consisting of hydrated sodium borate in crystalline form; an important source of boron | - |
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| kerosene | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosine, lamp oil |
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| kerosine | (noun) a flammable hydrocarbon oil used as fuel in lamps and heaters | Synonyms: coal oil, kerosene, lamp oil |
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| kerugma | (noun) preaching the gospel of Christ in the manner of the early church | Synonyms: kerygma |
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| kerygma | (noun) preaching the gospel of Christ in the manner of the early church | Synonyms: kerugma |
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| kicker | (noun) a player who kicks the football | - |
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| kingmaker | (noun) an important person who can bring leaders to power through the exercise of political influence | - |
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| knacker | (noun) someone who buys up old horses for slaughter | - |
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| (noun) someone who buys old buildings or ships and breaks them up to recover the materials in them | - |
| knackered | (adjective) extremely exhausted | Synonyms: drained |
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| knickerbockers | (noun) (used in the plural) trousers ending above the knee | Synonyms: breeches, knee breeches, knee pants, knickers |
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| knickers | (noun) (used in the plural) underpants worn by women | Synonyms: bloomers, drawers, pants |
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| (noun) (used in the plural) trousers ending above the knee | Synonyms: breeches, knee breeches, knee pants, knickerbockers |
| knickknackery | (noun) miscellaneous curios | Synonyms: bric-a-brac, knickknack, nicknack, whatnot |
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| knobkerrie | (noun) a short wooden club with a heavy knob on one end; used by aborigines in southern Africa | Synonyms: knobkerry |
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| knobkerry | (noun) a short wooden club with a heavy knob on one end; used by aborigines in southern Africa | Synonyms: knobkerrie |
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| knocker | (noun) a device (usually metal and ornamental) attached by a hinge to a door | Synonyms: doorknocker, rapper |
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| (noun) either of two soft fleshy milk-secreting glandular organs on the chest of a woman | Synonyms: boob, bosom, breast, tit, titty |
| (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, detractor, disparager |
| (noun) a person who knocks (as seeking to gain admittance) | - |
| (noun) (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person | - |
| lawbreaker | (noun) someone who violates the law | Synonyms: law offender, violator |
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| lawmaker | (noun) a maker of laws; someone who gives a code of laws | Synonyms: lawgiver |
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