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.
darkly darkle trickly trickily trigly draggle treacly trickle truckle
murkly darkly freakily freckly jerkily crackly creakily croakily quirkily mirkily murkily perkily prickly darkle trickily trickly
dark darkey darkie darky daric dirk dork dorky drake drek