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.
carpi carp crap crappie creepie crop croppie cripe croup creep crepy crepe crape crappy creepy crepey croupe croupy groupie gorp grip
carpi euripi harp harpy carp priapi tarp warp charpai sharp sharpie sharpy
car care carr carry acari scar scare scarey scarry scary