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.
creek creak greek creaky cark cork crake crock cruck crack crook croak corky crick carack cracky crikey croaky carrack crickey crag croc grok kirk
creek reek greek reck reeky wreak wreck break eureka freak phreak creak dreck drek trek shriek
care core crew cure gree acre ocrea ocreae reeker reekier scree screw screwy cheekier