| gunboat | (noun) a small shallow-draft boat carrying mounted guns; used by costal patrols | - |
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| guncotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, nitrocellulose, nitrocotton |
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| gunfight | (noun) a fight involving shooting small arms with the intent to kill or frighten | Synonyms: gunplay, shootout |
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| gunfire | (noun) the act of shooting a gun | Synonyms: gunshot |
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| gunflint | (noun) the piece of flint that provides the igniting spark in a flintlock weapon | - |
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| gunite | (noun) a mixture of cement and sand and water that is sprayed on a surface under pneumatic pressure | - |
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| gunk | (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, muck, ooze, slime, sludge |
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| gunlock | (noun) the action that ignites the charge in a firearm | Synonyms: firing mechanism |
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| gunman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunslinger, hired gun, hit man, hitman, shooter, torpedo, triggerman |
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| (noun) a person who shoots a gun (as regards their ability) | Synonyms: gun |
| gunmetal | (noun) a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water) | - |
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| gunnel | (noun) small eellike fishes common in shallow waters of the northern Atlantic | Synonyms: bracketed blenny |
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| (noun) wale at the top of the side of boat; topmost planking of a wooden vessel | Synonyms: gun rest, gunwale |
| gunner | (noun) a serviceman in the artillery | Synonyms: artilleryman, cannoneer, machine gunner |
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| gunnery | (noun) guns collectively | - |
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| gunny | (noun) coarse jute fabric | Synonyms: burlap |
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| gunnysack | (noun) a bag made of burlap | Synonyms: burlap bag, gunny sack |
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| gunplay | (noun) a fight involving shooting small arms with the intent to kill or frighten | Synonyms: gunfight, shootout |
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| gunpoint | (noun) the gun muzzle's direction | Synonyms: point |
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| gunpowder | (noun) a mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks | Synonyms: powder |
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| gunrunner | (noun) a smuggler of guns | Synonyms: arms-runner |
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| gunrunning | (noun) the smuggling of guns and ammunition into a country secretly and illegally | - |
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| gunshot | (noun) the act of shooting a gun | Synonyms: gunfire |
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| gunsight | (noun) a sight used for aiming a gun | Synonyms: gun-sight |
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| gunslinger | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, hired gun, hit man, hitman, shooter, torpedo, triggerman |
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| gunsmith | (noun) someone who makes or repairs guns | - |
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| gunstock | (noun) the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun | Synonyms: stock |
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| gunwale | (noun) wale at the top of the side of boat; topmost planking of a wooden vessel | Synonyms: gun rest, gunnel |
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| guppy | (noun) small freshwater fish of South America and the West Indies; often kept in aquariums | Synonyms: Lebistes reticulatus, rainbow fish |
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| gurgle | (noun) the bubbling sound of water flowing from a bottle with a narrow neck | - |
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| gurnard | (noun) bottom-dwelling coastal fishes with spiny armored heads and fingerlike pectoral fins used for crawling along the sea bottom | - |
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| gurney | (noun) a metal stretcher with wheels | - |
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| guru | (noun) a Hindu or Buddhist religious leader and spiritual teacher | - |
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| (noun) a recognized leader in some field or of some movement | - |
| gush | (noun) an unrestrained expression of emotion | Synonyms: blowup, ebullition, effusion, outburst |
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| (noun) a sudden rapid flow (as of water) | Synonyms: flush, outpouring |
| gusher | (noun) an oil well with a strong natural flow so that pumping is not necessary | - |
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| gusset | (noun) a piece of material used to strengthen or enlarge a garment | Synonyms: inset |
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| (noun) a metal plate used to strengthen a joist | Synonyms: gusset plate |
| (noun) a piece of chain mail covering a place unprotected by armor plate | Synonyms: voider |
| gust | (noun) a strong current of air | Synonyms: blast, blow |
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| gustation | (noun) the faculty of distinguishing sweet, sour, bitter, and salty properties in the mouth | Synonyms: gustatory modality, sense of taste, taste |
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| gusto | (noun) vigorous and enthusiastic enjoyment | Synonyms: relish, zest, zestfulness |
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| gut | (noun) a strong cord made from the intestines of sheep and used in surgery | Synonyms: catgut |
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| (noun) the part of the alimentary canal between the stomach and the anus | Synonyms: bowel, intestine |
| (noun) a narrow channel or strait | - |
| gutlessness | (noun) the trait of lacking courage and determination; fearful of loss or injury | - |
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| guts | (noun) fortitude and determination | Synonyms: backbone, grit, gumption, moxie, sand |
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| gutsiness | (noun) the trait of showing courage and determination in spite of possible loss or injury | Synonyms: pluck, pluckiness |
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| gutter | (noun) a channel along the eaves or on the roof; collects and carries away rainwater | Synonyms: trough |
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| (noun) a tool for gutting fish | - |
| (noun) a worker who guts things (fish or buildings or cars etc.) | - |
| (noun) misfortune resulting in lost effort or money | Synonyms: sewer, toilet |
| guttersnipe | (noun) a child who spends most of his time in the streets especially in slum areas | Synonyms: street urchin |
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| guttural | (noun) a consonant articulated in the back of the mouth or throat | Synonyms: guttural consonant, pharyngeal, pharyngeal consonant |
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| guvnor | (noun) (British slang) person in command | - |
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| guy | (noun) a cable, wire, or rope that is used to brace something (especially a tent) | Synonyms: guy cable, guy rope, guy wire |
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| (noun) an informal term for a youth or man | Synonyms: bozo, cat, hombre, sod |
| guyot | (noun) a seamount of volcanic origin (especially in the Pacific Ocean) | - |
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| guzzler | (noun) someone who drinks heavily (especially alcoholic beverages) | - |
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| (noun) a drinker who swallows large amounts greedily | Synonyms: gulper |
| guzzling | (noun) the drinking of large mouthfuls rapidly | Synonyms: gulping, swilling |
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