| bighorn | (noun) wild sheep of mountainous regions of western North America having massive curled horns | Synonyms: bighorn sheep, cimarron, Ovis canadensis, Rocky Mountain bighorn, Rocky Mountain sheep |
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| blackthorn | (noun) erect and almost thornless American hawthorn with somewhat pear-shaped berries | Synonyms: Crataegus calpodendron, Crataegus tomentosa, pear haw, pear hawthorn |
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| (noun) a thorny Eurasian bush with plumlike fruits | Synonyms: Prunus spinosa, sloe |
| boxthorn | (noun) any of various shrubs or vines of the genus Lycium with showy flowers and bright berries | Synonyms: matrimony vine |
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| buckthorn | (noun) any shrub or small tree of the genus Bumelia | - |
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| (noun) a shrub or shrubby tree of the genus Rhamnus; fruits are source of yellow dyes or pigments | - |
| (noun) an Old World plantain with long narrow ribbed leaves widely established in temperate regions | Synonyms: English plantain, narrow-leaved plantain, Plantago lanceolata, ribgrass, ribwort, ripple-grass |
| bullhorn | (noun) a portable loudspeaker with built-in microphone and amplifier | Synonyms: loud-hailer, loud hailer |
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| crumhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, krummhorn |
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| firethorn | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, pyracanth, Pyracantha |
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| fluegelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: flugelhorn |
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| flugelhorn | (noun) a brass instrument resembling a cornet but with a wider bore | Synonyms: fluegelhorn |
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| foghorn | (noun) a warning device consisting of a horn that generates a loud low tone | - |
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| (noun) a loud low warning signal that can be heard by fogbound ships | Synonyms: fogsignal |
| greenhorn | (noun) an awkward and inexperienced youth | Synonyms: cub, rookie |
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| hawthorn | (noun) a spring-flowering shrub or small tree of the genus Crataegus | Synonyms: haw |
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| horn | (noun) one of the bony outgrowths on the heads of certain ungulates | - |
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| (noun) any hard protuberance from the head of an organism that is similar to or suggestive of a horn | - |
| (noun) a brass musical instrument consisting of a conical tube that is coiled into a spiral and played by means of valves | Synonyms: French horn |
| (noun) a brass musical instrument with a brilliant tone; has a narrow tube and a flared bell and is played by means of valves | Synonyms: cornet, trump, trumpet |
| (noun) an alarm device that makes a loud warning sound | - |
| (noun) a high pommel of a Western saddle (usually metal covered with leather) | Synonyms: saddle horn |
| (noun) a device on an automobile for making a warning noise | Synonyms: automobile horn, car horn, hooter, motor horn |
| (noun) a noisemaker (as at parties or games) that makes a loud noise when you blow through it | - |
| (noun) a device having the shape of a horn | - |
| (noun) a noise made by the driver of an automobile to give warning | - |
| (noun) the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails | - |
| krummhorn | (noun) a Renaissance woodwind with a double reed and a curving tube (crooked horn) | Synonyms: cromorne, crumhorn |
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| leghorn | (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, Panama, Panama hat, sailor, skimmer, straw hat |
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| longhorn | (noun) long-horned beef cattle formerly common in southwestern United States | Synonyms: Texas longhorn |
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| pronghorn | (noun) fleet antelope-like ruminant of western North American plains with small branched horns | Synonyms: American antelope, Antilocapra americana, prongbuck, pronghorn antelope |
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| saxhorn | (noun) any of a family of brass wind instruments that resemble a bugle with valves | - |
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| shoehorn | (noun) a device used for easing the foot into a shoe | - |
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| shorthorn | (noun) English breed of short-horned cattle | Synonyms: Durham |
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| stinkhorn | (noun) any of various ill-smelling brown-capped fungi of the order Phallales | Synonyms: carrion fungus |
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| stockhorn | (noun) an ancient (now obsolete) single-reed woodwind; usually made of bone | Synonyms: hornpipe, pibgorn |
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| thorn | (noun) something that causes irritation and annoyance | Synonyms: irritant |
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| (noun) a Germanic character of runic origin | - |
| (noun) a small sharp-pointed tip resembling a spike on a stem or leaf | Synonyms: pricker, prickle, spikelet, spine, sticker |
| whitethorn | (noun) thorny Eurasian shrub of small tree having dense clusters of white to scarlet flowers followed by deep red berries; established as an escape in eastern North America | Synonyms: Crataegus laevigata, Crataegus oxycantha, English hawthorn, may |
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