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.
gambols gambles gumboils gumballs camels camails gumless kamalas camelias camellias cumulus kummels
symbols gambols mols moles cymbals tymbals tombolos molls timbals cymols rambles wimbles mools sambals numbles mumbles moils gambles molas umbles embolus ambles jumbles gumboils tumbles tombolas amoles ramblas nombles humbles gimbals rumbles fumbles fimbles bumbles jumbals umbels wambles shambles