| bug | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: hemipteran, hemipteron, hemipterous insect |
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| (noun) general term for any insect or similar creeping or crawling invertebrate | - |
| (noun) a minute life form (especially a disease-causing bacterium); the term is not in technical use | Synonyms: germ, microbe |
| (noun) a small hidden microphone; for listening secretly | - |
| (noun) a fault or defect in a computer program, system, or machine | Synonyms: glitch |
| (verb) annoy persistently | Synonyms: badger, beleaguer, pester, tease |
| (verb) tap a telephone or telegraph wire to get information | Synonyms: intercept, tap, wiretap |
| bugaboo | (noun) a source of concern | - |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugbear |
| bugbane | (noun) a plant of the genus Cimicifuga having flowers in long racemes or panicles reported to be distasteful to insects | - |
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| (noun) North American plant having large leaves and yellowish green flowers growing in racemes; yields a toxic alkaloid used medicinally | Synonyms: American hellebore, Indian poke, Veratrum viride, white hellebore |
| bugbear | (noun) an object of dread or apprehension | Synonyms: hobgoblin |
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| (noun) an imaginary monster used to frighten children | Synonyms: bogeyman, booger, boogeyman, bugaboo |
| bugged | (adjective) having hidden electronic eavesdropping devices | Synonyms: wired |
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| bugger | (noun) someone who engages in anal copulation (especially a male who engages in anal copulation with another male) | Synonyms: sod, sodomist, sodomite |
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| (verb) practice anal sex upon | Synonyms: sodomise, sodomize |
| buggery | (noun) intercourse via the anus, committed by a man with a man or woman | Synonyms: anal intercourse, anal sex, sodomy |
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| bugginess | (noun) the state of having bugs | - |
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| buggy | (adjective) infested with bugs | - |
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| (adjective) informal or slang terms for mentally irregular | Synonyms: around the bend, balmy, barmy, bats, batty, bonkers, cracked, crackers, daft, dotty, fruity, haywire, kookie, kooky, loco, loony, loopy, nuts, nutty, round the bend, wacky, whacky |
| (noun) a small lightweight carriage; drawn by a single horse | Synonyms: roadster |
| bugle | (noun) a brass instrument without valves; used for military calls and fanfares | - |
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| (noun) a tubular glass or plastic bead sewn onto clothing for decoration | - |
| (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugleweed |
| (verb) play on a bugle | - |
| bugler | (noun) someone who plays a bugle | - |
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| bugleweed | (noun) any of various low-growing annual or perennial evergreen herbs native to Eurasia; used for ground cover | Synonyms: bugle |
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| (noun) a mildly narcotic and astringent aromatic herb having small whitish flowers; eastern United States | Synonyms: Lycopus virginicus |
| bugloss | (noun) perennial or biennial herb cultivated for its delicate usually blue flowers | Synonyms: alkanet, Anchusa officinalis |
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| (noun) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States | Synonyms: bitterweed, bristly oxtongue, oxtongue, Picris echioides |
| bugologist | (noun) a zoologist who studies insects | Synonyms: bug-hunter, entomologist |
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| bugology | (noun) the branch of zoology that studies insects | Synonyms: entomology |
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