| brook | (noun) a natural stream of water smaller than a river (and often a tributary of a river) | Synonyms: creek |
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| 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 |
| 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 |