| birr | (noun) the basic unit of money in Ethiopia; equal to 100 cents | - |
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| (noun) sound of something in rapid motion | Synonyms: whir, whirr, whirring |
| burr | (noun) rough projection left on a workpiece after drilling or cutting | - |
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| (noun) rotary file for smoothing rough edges left on a workpiece | - |
| (noun) small bit used in dentistry or surgery | Synonyms: bur |
| (noun) seed vessel having hooks or prickles | Synonyms: bur |
| charr | (noun) any of several small trout-like fish of the genus Salvelinus | Synonyms: char |
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| cockleburr | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cocklebur |
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| parr | (noun) a young salmon up to 2 years old | - |
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| (noun) the young of various fishes | - |
| purr | (noun) a low vibrating sound typical of a contented cat | - |
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| torr | (noun) a unit of pressure equal to 0.001316 atmosphere; named after Torricelli | Synonyms: millimeter of mercury, mm Hg |
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| whirr | (noun) sound of something in rapid motion | Synonyms: birr, whir, whirring |
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