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