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.
colleen clean colon colin callan colone coloni colony cullion galleon gallein clon clan glen cline clone clown glean galena gallon kaolin cauline galloon kaoline
colleen baleen fallen villein gallein galleon mullein mullen pollen relleno sullen woollen
cole callee collie colly coolly coulee col