| brook | (noun) a natural stream of water smaller than a river (and often a tributary of a river) | Synonyms: creek |
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| brooklet | (noun) a small brook | - |
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| brooklime | (noun) plant of western North America and northeastern Asia having prostrate stems with dense racemes of pale violet to lilac flowers | Synonyms: American brooklime, Veronica americana |
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| (noun) European plant having low-lying stems with blue flowers; sparsely naturalized in North America | Synonyms: European brooklime, Veronica beccabunga |
| brookweed | (noun) water pimpernel of Europe to China | Synonyms: Samolus valerandii |
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| (noun) American water pimpernel | Synonyms: Samolus floribundus, Samolus parviflorus |
| crook | (noun) a long staff with one end being hook shaped | Synonyms: shepherd's crook |
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| (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, felon, malefactor, outlaw |
| (noun) a circular segment of a curve | Synonyms: bend, turn, twist |
| crookback | (noun) a person whose back is hunched because of abnormal curvature of the upper spine | Synonyms: humpback, hunchback |
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| crookedness | (noun) having or distinguished by crooks or curves or bends or angles | - |
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| (noun) the quality of being deceitful and underhanded | Synonyms: deviousness |
| (noun) a tortuous and twisted shape or position | Synonyms: contortion, torsion, tortuosity, tortuousness |
| crookneck | (noun) yellow squash with a thin curved neck and somewhat warty skin | Synonyms: crookneck squash, summer crookneck |
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| rook | (noun) common gregarious Old World bird about the size and color of the American crow | Synonyms: Corvus frugilegus |
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| (noun) (chess) the piece that can move any number of unoccupied squares in a direction parallel to the sides of the chessboard | Synonyms: castle |
| rookery | (noun) a breeding ground for gregarious birds (such as rooks) | - |
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| rookie | (noun) an awkward and inexperienced youth | Synonyms: cub, greenhorn |
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