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.
conic kaonic conk conga congo conky congou cooing quinic cooeeing gong konk
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
coni con coign coin cone coney conn cony coon gonia icon coigne scone