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.
pianic panic pionic panicky hypnic pinkie pang ping pink pinky panga pinko pingo piing hyping peeing pieing pinkey pooing hypoing
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
pian piano pan pin pain spinny pane spine panne span pawn epinaoi pawnee pion pean pinny pein piny pine apian piney opine pinna spin pinnae spinney pina spiny