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.
cookout cooked coquet cocotte cockatoo coequate coquette coact coked cocked cockade coquito
cookout lookout backout lockout knockout sickout takeout checkout shakeout
cook coocoo cookey cookie cooky