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.
croakily creakily crackly craggily crackle groggily quirkily caracal caracol caracul coracle karakul caracole curricle
freakily creakily croakily jerkily crackly quirkily mirkily murkily perkily darkly trickily
croaky croak crack cracky crake creak creaky crock crook