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.
greets greats greeds garrets grots grits cruets gratis grades grides creeds carets groats grouts griots grates curets grottos creates gourdes garotes curettes keiretsu grottoes garottes garrotes grids crits karts carts grads creds garrottes korats krauts credos curtsy quarts cartes kraits crates guards crudes gourds carats quirts karats courts kurtas gradus carrots karates quartes caritas curtesy carates curates croutes curites quartos curtsey corodies corrades corrodes courtesy cowrites crowdies
greets reeds turrets treats parietes keiretsu greeds garrets cruets carets rets aretes barrets berets bredes redes burets ferrets frets verts haeredes heredes jereeds jerreeds creeds curets greats breeds nerts terrets trets cherts
greed greedy greet creed gored great agreed egret