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.
full fully foully fell fill fuel fall foul fella fille filly felly fillo folly faille fellow follow fallow felloe fellah fil fly flu flew flaw flea flee foil flue fila flow filo feal fool fley fail vill feel fowl file flay floe foal feyly flawy foley folia folio ghoul ghyll villa villi
bull full hull cull gull lull mull null pull dull