Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ālĕātor, ōris, m. [alea], a player with dice, also a gamester in gen., Plaut. Rud. 2, 3, 29; Cic. Cat. 2, 10, 23; id. Phil. 2, 27: aleatoris castra, id. Verr. 2, 5, 13; so Sid. Ep. 5, 17; Dig. 11, 5; Cod. 3, 43.