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.
colonies colones colonize colonise colons clones colonus clons coolness clines clonus clowns colins callowness collins cullions kaolines colleens clans cleanness cleans gluons cleanse callans kaolins gallons gluiness guylines galleons galloons glueyness glans glens kilns gleans
loonies felonies colonies lionize colonize looneys baloneys colones leones lioness lionise clones lunies ballonnes blennies boloneys valonias villainies violones colonise chalones
colon colone coloni colony clon clone clown colin