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.
cresses caresses crosses creeses creases curses crises crases carses corses cruses cuirasses grasses grosses cruises courses greases karosses carouses curassows carassows gorses crazes cruces krises crozes crasis crisis carices coerces crazies kerseys grouses curacies griseous coriaceous graces grazes coryzas grecize
heiresses seeresses peeresses duresses dresses presses cresses tresses caresses prosses verses harasses reassess erses reuses heresies phereses crosses cuirasses grasses frasses phoresies creeses uraeuses diaereses whereases diureses trasses wrasses prisses karosses greases morasses brasses pareses boreases grosses diereses resees perses brisses creases cereuses foresees trusses ureases drosses chorusses
cressy cress cares caress cores crass crease creasy creese crews cries crissa cross crosse cures acres