Here's what rhymes with antitrinitarian.
trinitarian carrion ovarian libertarian clarion agrarian librarian barbarian proletarian sectarian vegetarian sanitarian seminarian cnidarian utilitarian egalitarian totalitarian centenarian vulgarian authoritarian humanitarian antiquarian communitarian veterinarian parliamentarian nonsectarian nonagenarian disciplinarian octogenarian valetudinarian latitudinarian sexagenarian septuagenarian Words that almost rhyme with antitrinitarian
barium chameleon planetarium vivarium nobelium aquarium honorarium sanitarium ferryman ferrymen lesbian thespian pedestrian vestrymen vestryman equestrian