Underwoods rhymes with:
attwoods, cottonwoods, dogwoods, eastwood's, ellwood's, foxwoods, glenwood's, hardwoods, hazelwood's, hollywood's, ironwood's, lockwood's, packwood's, presswoods, redwoods, rosewood's, sherwood's, wedgewood's, westwood's, wildwoods, winwood's
Underwoods sounds like:
underdog, underdogs, undertake, undertakes, undertook, undertows, underwrites, unitrode's, untruths