Uncommon rhymes with:
common, ducommun, mccommon, ahmann, aman, bahman, common, dahman, ducommun, hamann, lahman, lahmann, mccommon, ommen, plamann, rahman, strommen, thommen
Uncommon sounds like:
uncanny, unicom, unikom, unionism, unisom, unison, unknown, unosom, unscom, unseen, unshaken