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.
panic pianic panicky hypnic pionic pang panga pinkie punkie ping pink pong pung punk
manic pianic panic hygienic hyphenic aeonic bionic genic vinic cynic pionic snick xenic tonic tunica hyenic phonic nick banco kaonic ionic hypnic runic muonic scenic conic sonic manioc tannic quinic tunic maniac hyaenic yonic
pan pain pane panne pawn pawnee pean pian piano span