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.
crept crypt creped carpet crypto corrupt creeped gript carped craped crapped cropped
crept rapt repot wrapt bewrapt erupt firepot irrupt carpet corrupt crypt gript rewrapt dript dropt trapt
crepey crepe crepy carp carpi crap crape crappie crappy creep creepie creepy cripe crop croppie