Grantree's rhymes with:
rowntree's, baytree's, rowntree's, antifreeze, baytree's, filigrees, rowntree's, analyses, angeles', annie's, antifreeze, antigone's, antigones, applebee's, baytree's, beebe's, beebes, bradlees, bramalea's, bureaucratese, calliopes, celanese, cherokee's, cherokees, damocles, delaurentiis, diocese, dioceses, eddie's, elouise, elysees, emphases, feces, filigrees, grammies, greenlees, hawaii's, headcheese, hercules, honeybees, humvee's, humvees, hyades, hypotheses, idiosyncrasies, indices, isosceles, ladies', laurentiis, lebanese, lily's, maccabees, machetes, manatees, manganese, markey's, matterease, memories', monsees, mountleigh's, munchies, nobodies, nobody's, oversees, parentheses, penikese, pleiades, portuguese, rameses, ramses, rowntree's, socrates, striptease, sunnis, testes, wannabees, wannabes, wedowee's
Grantree's sounds like:
gerrymanders, grantors, grinders, groundwork, guarantors