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.
snick snuck snack sonic sneck scenic sank sync sink sunk cynic xenic snake sneak snook snaky snakey sneaky seneca zincky sang sing snag snog snug song sung zinc zonk
nick snick runic scenic sneck bionic bannock nock knock neck wryneck knack hygienic manioc hypnic panicky pionic snuck xenic tannic tunic winnock hyenic kaonic maniac pianic finnicky panic muonic manic conic genic quinic aeonic vinic ionic hyphenic phonic snack cynic finicky bonnock sonic zincky tonic tunica hyaenic yonic