I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
grates groats gratis greats grades crates karates curates carates garotes creates grads grots grits garrotes garottes grottoes garrottes krauts gradus cartes korats carats greets grides greeds karats griots kraits grouts gourdes croutes curtesy grottos quartes curites garrets courtesy keratose cowrites curettes corrades creds crits karts grids carts courteous curtsy creeds kurtas credos guards curets cruets carets crudes quirts quarts courts gourds quartos cardias curtsey caritas carrots corodies corridas corrodes crowdies keiretsu queridas
rates prates pirates curates urates hydrates creates narrates aerates muriates carates seriates gyrates laureates variates cerates borates derates karates berates ferrates deaerates orates serrates crates phorates grates brutes curtesy jurats garrotes frats kraits harts virtues carts barites ratos burettes hearties ferities quarts forties reroutes reties garotes grottoes boarts verites riatas barrettes sorties parts barytes charts charades purities treaties trades tirades marts dirties derats rites syrettes quartes corrades parietes rottes groats garottes fortes parades curettes farts brats cartes parties proteus certes arts treats pretties ariettes irades prats varieties pyrites rarities pirouettes reatas rotes proettes rewrites cowrites aretes greats carats routes hearts courtesy erratas verities karts grades garrottes croutes proteas curites cerites frites rats krauts norites yperites writes lariats ferrites gratis karats sorites parities sureties darts korats diorites drats tarts tortes traits warts charities shorties
grat grate crate grad grade great grit gritty groat grot grotto grotty