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.
cassata casita cast caseate cassette caste coast costa cosset costae cuesta casette cost gast cased coset caused cussed gassed gusset coesite gaseity
cassata satay fissate fossate misseat disseat sat