| arboretum | (noun) a facility where trees and shrubs are cultivated for exhibition | Synonyms: botanical garden |
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| 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 |
| 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 |
| jamboree | (noun) a gay festivity | Synonyms: blowout, gala, gala affair |
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| laborer | (noun) someone who works with their hands; someone engaged in manual labor | Synonyms: jack, labourer, manual laborer |
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| smoothbore | (noun) a firearm that has no rifling | - |
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| taboret | (noun) a low stool in the shape of a drum | Synonyms: tabouret |
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| woodborer | (noun) any of various insects or larvae or mollusks that bore into wood | Synonyms: borer |
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