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.
kas kaes koas kays kaas keas kos kis gas goas keys caws kiss gaes casa gays kues case koss kois cays quays quasi kusso gauss gawsy gassy cause kissy kazoo quais quass cassia causey gawsie kousso queasy