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.
kreep creep creepy creepie crepe crepy crepey carp crap crop gorp grip
creep kreep rep reap repo repp arepa creepy crepe crepy preop prep