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