| Word | Definitions | Synonyms |
|---|---|---|
| rook | (noun) common gregarious Old World bird about the size and color of the American crow | Synonyms: Corvus frugilegus |
| (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) | - |
| rookie | (noun) an awkward and inexperienced youth | Synonyms: cub, greenhorn |