WordNet sense 1 (any of several perennials of the genus Aletris having grasslike leaves and bitter roots reputed to cure colic):

colicroot, crow corn, unicorn root

WordNet sense 2 (trailing grass native to Europe now cosmopolitan in warm regions; used for lawns and pastures especially in southern United States and India):

doob, kweek, Bahama grass, Cynodon dactylon, devil grass, scutch grass, Bermuda grass

WordNet sense 3 (perennial Australian grass having numerous long spikes arranged like the vanes of a windmill):

windmill grass, Chloris truncata, creeping windmill grass