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.
caseate casette caste cassette cast cassata coset coast cased caused cosset casita coesite gaseity gazette cost gast cosied costae cussed gassed gusset keyset
caseate roseate nauseate sate seat rosette reseat noisette misseat miseat misate lysate cassette poussette fissate setae saute musette fossette casette fossate disseat sat set