Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
convīcĭātor (convīt-), ōris, m. [convicior], a railer, reviler (very rare), * Cic. Mur. 6, 13; Sen. Ira, 3, 24, 1; Suet. Tib. 11 al.