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.
colonus colons clonus colones clons colonise colonies colins clowns clones collins colleens coolness colonize clans cullions gluons cleans clines callowness gallons cleanse callans kaolins galleons galloons kaolines cleanness glans glens kilns gleans galenas kalians
clonus colonus loans belons balloons ballons aloins loons billions loins hellions lions clones galloons melons mullions pillions pylons salons silenus solons talions chalones galleons bullions billons gallons felons violones halons jillions clons clowns eloins colons bouillons cullions colones gluons millions nylons pleons reloans saloons solions zillions talons shalloons
colon colone coloni colony clon clone clown colin