| 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 |
| counterbore | (noun) a bit for enlarging the upper part of a hole | Synonyms: countersink, countersink bit |
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| hellebore | (noun) any plant of the Eurasian genus Helleborus | - |
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| (noun) perennial herbs of the lily family having thick toxic rhizomes | Synonyms: false hellebore |
| smoothbore | (noun) a firearm that has no rifling | - |
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