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.
creped creeped carped craped crapped cropped crept carpet griped groped gripped grouped crypt crypto corrupt groupoid
creeped creped burped frapped harped carped craped crapped raped cropped gripped rewrapped prepped cirripede syruped dripped dropped trapped tripped trouped warped chirruped grouped bewrapped rouped larruped ripped riped repped reaped wrapped rapped roped griped groped propped cirriped siruped draped drooped torpedo trepid trooped urped chirped sharped
crepey crepe crepy carp carpi crap crape crappie crappy creep creepie creepy cripe crop croppie