Rothbard rhymes with:
belabored, blackbird, chambered, clambered, clinkenbeard, clobbered, cupboard, dismembered, encumbered, harbored, hebard, hibbard, hibberd, hubbard, hulbard, hulburd, labombard, labored, lumbard, membered, misremembered, numbered, outnumbered, remembered, scabbard, sobered, starboard, unencumbered
Rothbard sounds like:
radbert, radford, redbird, redford, rothbart