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.
xenic scenic cynic snick sonic seneca sync zinc
hyphenic scenic hyenic hygienic xenic hyaenic genic bionic phonic manic snick tunica aeonic tonic muonic pianic kaonic renig cynic vinic ionic conic tunic tannic nick sonic runic manioc maniac pionic quinic panic hypnic yonic