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.
quittor quitter quieter gutter quoter guitar quatre cutter guttery guttier kiter cuter gator goitre gaiter cotter cottar guider couter cuatro goiter cattery cattier cautery cottier couture gaudier goutier
quittor quitter whitter titter suitor sitter ritter knitter bettor litter jitter hitter viator fitter faitour bitter tutor chitter tor