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.
heiresses heresies hearses harasses horses harissas hearsays heroizes heroicize
heiresses cresses seeresses caresses duresses dresses presses peeresses tresses brisses diaereses prisses morasses phoresies brasses drosses harasses frasses diureses cereuses creeses trusses grosses whereases creases phereses grasses crosses resees cuirasses karosses prosses reuses wrasses pareses trasses heresies greases boreases foresees ureases diereses chorusses
heiress heirs heres hires haeres heresy heroes hirees hers