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.
sunk sung sink sank sneak snick snack snaky snake sneck snuck snook suing snakey sneaky snug sync song sing snog snag sang zonk sanga sonic zinky
bunk funk hunk junk gunk lunk punk sunk dunk chunk