Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
expulsor, ōris, m. [expello], a driver out, expeller (very rare but class.): iste bonorum possessor, expulsor, ereptor, * Cic. Quint. 8, 30: tyranni, Nep. Dion. 10, 2.