Auth rhymes with:
broth, cloth, doth, fauth, froth, hauth, kauth, krauth, lauth, moth, rauth, roth, schroth, trauth
Auth sounds like:
ad, ada, adah, aday, add, added, addeo, addie, addy, ade, adee, adey, adia, adid, adieu, ado, ady, ahead, aid, aida, aide, aided, aidid, at, ata, ate, atha, athey, athie, atta, attaway, attie, attitude, attwood, atwood, aud, audet, audette, audi, audia, audio, audit, audited, auto, autodie, autotote, awad, await, awaited, awed, aweida, aydt, ayodhya, ayotte, ayyad