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.
colonize colonise colonies colones colons clones colonus coolness clons colins clonus clowns clines callowness cleanse collins colleens cullions kaolines cleanness clans cleans gluons
lionize colonize lionise loonies felonies hellenize colonies colonise melanize pollinize salinize
colon colone coloni colony clon clone clown colin