Thereabouts rhymes with:
about's, about's, bouts, about's, bouts, couts, coutts, doubts, drought's, droughts, flouts, fouts, foutz, houts, houtz, louts, out's, outs, pouts, scout's, scouts, shouts, snout's, snouts, spouts, sprouts, touts, trout's, youtz
Thereabouts sounds like:
therapeutic, therapeutics, thrift's, thrifts, thrifts', torpedoes, torpedos, tribute's, tributes, tripods, triptych, truffaut's, turbotax