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