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.
cassette casette caseate caste cosset gazette cast cassata coset coast cased caused casita gusset gassed cussed coesite gaseity cost gast cosied costae keyset kissed
fossette casette cassette rosette poussette noisette musette sett mozette nauseate settee gazette caseate bassett setae roseate mozzette set