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.
caseases caseoses cassises
caseases diseases ceases miseases deceases asceses disseises masseuses dioceses recesses reassesses seises caseoses possesses sasses cesses diseuses assesses wiseasses
casease casas caseose caseous cases causes causeys