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.
keas kas kaas keys kues kaes koas kays queasy gas kos kis caws goes gays kiss gaes cays cues kois goas koss casa case guess quais quays gassy gauss gawsy kazoo kissy quasi quass kusso queys
keas leas peas seas zoeas teas toeas sheas yeas as es