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.
tonic tunic tannic tunica tong tunicae tonga tanuki toeing tongue dong tang tank ting tung
bionic pionic tonic ionic kaonic yonic sonic conic phonic aeonic muonic hyphenic hyenic genic tunica hypnic cynic pianic xenic quinic manioc maniac manic panic snick hygienic vinic tannic hyaenic scenic runic nick tunic
ton tenia stoney atony teniae tone toney tonne tonneau tony toon toonie town townee townie towny atone atonia stone stony