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.
powter pouter potter powder pewter poutier powdery pottier pottery peter pater patter petter pitier poetry putter peatier pettier puttier padder
pewter powter fetter hater jitter jotter litter gnattier footer goiter buttery cautery nittier cattery cater quoter loiter natter vetter bootery lewder guttier getter matter writer patter meteor mater butter putter knotter phatter boater lotter haughtier hitter pottery zootier cuter fattier better gutter mitier hootier biter cottier bittier heater niter neater metier tooter tater dieter sitter touter dottier watery powder totter whetter rater uteri whitier wittier dotier chattery cheater chowder sheeter router shooter shutter wetter stere pettier teeter meatier ritter reutter rattier titer nettier rootier latter waiter nutter pouter souter seater pitier quieter daughter oater peter tattier outer muter eatery tear bitter couter pater petter cooter feater potter lottery quitter tier poutier suiter jittery gater cotter mattery battery littery cattier goutier battier auteur coater hauteur ruttier matier gaiter eater fatter beater cutter hotter kiter hatter mooter hetero jettier voter peatier liter knitter noter fitter guttery later nattier vetoer footier meeter pottier looter miter otter rioter retear ratter tetter baiter rooter hooter utter nitery meter sootier citer netter neuter dater letter knottier tatter mutter batter tauter steer titter puttier doughtier deter setter tottery dotter water nuttier toter wheatear tuatera watter whiter whitter doter chatter chattier chitter shatter rotter shittier shouter yatter
pot poet potto potty pout pouty spot spotty