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.
creakily croakily crackly craggily quirkily caracal caracol caracul karakul groggily
freakily creakily croakily jerkily crackly quirkily mirkily murkily perkily darkly trickily
creak creaky crack cracky crake creek croak croaky screak screaky