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.
caresses cresses carses crosses creeses creases karosses carouses curses crises cruses crases corses carassows cuirasses cruises courses carices grosses grasses greases curassows crasis crisis krises crozes cruces crazes gorses crazies grouses kerseys coerces curacies griseous coriaceous graces grazes
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
caress cares cars scares cures carassow caries carrs carse coarse cores crease cress cressy crews cries creasy acres creese scars