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.
cleek gleek calk caulk clack click cloak clock cluck colleague calque claque cloque clique cliquey cloacae colicky cowlick collogue clag clog gleg klik
leek belleek cleek gleek sleek lek leak leke leku bleak fleck sleeky