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.
greases grasses creases grazes graces crases gorses cresses grouses grosses creeses caresses griseous cuirasses crasis cruses carses krises corses curses crazes crises crosses kerseys cruises grecize courses crazies grazioso karosses curacies gracioso gracious graecize carouses curassows carassows grosz crozes cruces grosze groszy crisis carices coerces coryzas
boreases whereases greases ureases creases diureses seeresses diaereses prases reraises parses perses carses phrases morasses tresses caresses rases crases arses heiresses frasses harasses fraises foresees erses erases cuirasses urases duresses terrases peeresses hearses resews raises pareses wrasses phereses braises marses creeses arrases grasses cresses verses gyrases brasses reuses resees praises presses cereuses surcease diereses dresses hydrases trasses uraeuses charases
grease greasy crease creasy gores grass grassy grays grees greys grues egress ogres ogress