Syntrex rhymes with:
intrex, centrex, intrex, centrex, intrex, barracks, centrex, horrocks, intrex, microx, norex, serex, terex, verex
Syntrex sounds like:
san-andreas, sanders, sanders's, sandrock, saunders, saunders', saunders's, saundra's, schneider's, schneiders, schneiders', schnieders, schnyder's, secondaries, senator's, senators, senators', senders, senters, sentras, sentries, signatories, signatures, sinatra's, smathers, smethers, smithers, smothers, smotrich, snyder's, sonatrach, soundtrack, soundtracks, squanders, summiteers, syndrich