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.
caseose caseous casease cases causes gaseous causeys casas gases coses casus cusses cassis coseys gasses cosies cussos cassias cuisses gausses quasses gazoos gooses guises kazoos kisses kussos guesses gussies koussos
caseose seise casease caseous gaseous masseuse misease gneissose nauseous osseous paseos disease diseuse disseise sos