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.
tuneless toneless tunnels townless downless tenailles dynels tenails toenails dunghills
lineless paneless wineless maneless tuneless boneless toneless zoneless snowless moneyless runless innless sinewless hyphenless downless gainless sunless aneles hymnless kinless townless winless finless awnless boonless unless cineoles moonless nounless quenelles veinless reinless gunless penniless painless sinless rainless sonless manless chinless