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.
fowl foul flow fool foal foil folia folly folio foley follow fallow fellow foully fil fly flu flay fill flue fuel feal fley fail full flee flaw fell fall feel flea fila vole file flew filo viol floe feyly voile fillo flawy fella felly fille viola ghoul filly fully voila
bowl fowl howl jowl cowl owl yowl