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.
qophs kophs caphs kaphs coughs quaighs
qophs kophs sophs tophs raphis typhus raphes tophes syphs scyphus caphs ouphs kaphs ephas aphis phis tophus ouphes yoghs