Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
com-mănĭpŭlāris, is, m., a comrade who is in the same manipulus, Tac. H. 4, 46; Inscr. Orell. 3557.
So also ‡ COMMANIPVLARIVS, ii, Inscr. Rein. 8, 74.