Conjoin rhymes with:
enjoin, adjoin, enjoin, join, rejoin, adjoin, ardoin, aucoin, beaudoin, boudoin, bourgoin, bowdoin, boyne, broin, burgoyne, chaudoin, chicoine, coin, coyne, des_moines, enjoin, goin, goyne, groin, hoyne, jodoin, join, lemoine, leoine, loin, mccoin, mcgloin, micoin, purloin, raboin, rejoin
Conjoin sounds like:
cancan, cancienne, cancino, cancom, cancun, cangemi, cangiano, canson, canzano, chang-hsin, changchun, chiengmai, cinnaminson, cinnamonson, cinquemani, coenzyme, comecon, commision, commission, communism, concannon, concession, concussion, conkin, conshohocken, consign, consume, cookingham, cunningham, cyanazine, cynicism