| bore | (noun) a hole or passage made by a drill; usually made for exploratory purposes | Synonyms: bore-hole, drill hole |
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| (noun) diameter of a tube or gun barrel | Synonyms: caliber, calibre, gauge |
| (noun) a high wave (often dangerous) caused by tidal flow (as by colliding tidal currents or in a narrow estuary) | Synonyms: aegir, eager, eagre, tidal bore |
| (noun) a person who evokes boredom | Synonyms: dullard |
| boreas | (noun) a wind that blows from the north | Synonyms: north wind, norther, northerly |
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| borecole | (noun) a hardy cabbage with coarse curly leaves that do not form a head | Synonyms: Brassica oleracea acephala, cole, colewort, kail, kale |
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| boredom | (noun) the feeling of being bored by something tedious | Synonyms: ennui, tedium |
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| borer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: woodborer |
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| (noun) a drill for penetrating rock | Synonyms: bore bit, rock drill, stone drill |