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.
groats grots gratis grates griots grouts greats garotes grottos grits grads garrotes grottoes garottes krauts korats grades greets karats crates gradus kraits carats garrottes carrots creates karates garrets carates croutes curates keratose crits karts grids carts cruets guards courts gourds curets greeds quirts quarts cartes credos curtsy crowds kurtas grides carets curites gourdes caritas cardias quartos curtesy curtsey quartes corodies corrades corridas corrodes courtesy cowrites crowdies curettes keiretsu queridas
groats broads grouts ratos treats krauts carts karats derats riots farts borts greats jurats lariats roads rats riatas harts marts forts creates grates boarts aerates phorates warts sheroots worts trouts torts droits deaerates seriates ports korats garotes roots charts tarots sorts pierrots reatas muriates heriots orates carats parrots rotas prats brats gyrates garrotes crates ferrates laureates variates rots arts rotis quarts gratis byroads borates erratas rotos derates karates carrots kraits traits rates grots berates frats prates chariots griots orts carates narrates hearts morts routs parts serrates hydrates rotes urates curates karts pirates cerates darts drats tarts trots whorts cheroots shorts
groat garote garotte grad grade grat grate great griot grody grot grotto grotty grout grouty