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.
kookiness cockiness cakiness kokanees gawkiness quakiness coignes cocaines quickness cogons coigns cocains cocoons cockneys coquinas cocainize
hokiness cockiness kookiness pawkiness pokiness gawkiness geekiness ickiness leakiness luckiness yuckiness quakiness cakiness shakiness pickiness cheekiness tackiness rockiness wackiness jokiness kines likeness chicness bagginess weakness sickness meekness pugginess mugginess bogginess packness bigness pigginess legginess fogginess koines sogginess shagginess bugginess quickness kins