Same word as fellow:
assistant,associate,cohort,companion, compeer,comrade,concomitant, confrere,consort,coordinate,counterpart, coworker,double,duplicate,equal, instructor, lecturer,match,mate,member,partner,peer, professor,reciprocal,twin
assistant,associate,cohort,companion, compeer,comrade,concomitant, confrere,consort,coordinate,counterpart, coworker,double,duplicate,equal, instructor, lecturer,match,mate,member,partner,peer, professor,reciprocal,twin