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.
colleague collogue claque clag colloquy colog cleek colloquia colugo calque clique cloque cliquey coeliac clog gleg clack cloak cluck colic gleek gulag
league colleague plague plaguey