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.
touter toter totter tauter tooter tuatera tottery tater doter titer teeter doughtier titter detour tetter tatter dotter dottier tattier tuatara tattooer daughter titre dater tutor tetra tetri tatar deter dotier tedder tidier datura dieter dodder doddery dowdier
couter shouter tauter touter outer muter router neuter souter cuter pouter jitter bitter lauder butter nuttier louder letter cottier hootier cattery coater heater looter liter hetero hater boater mitier nettier gutter meatier gaiter knotter mutter cooter footer meteor kiter tattier quieter nutter pottier meter nattier citer quoter cautery getter setter oater sootier nittier rootier litter hitter auteur totter tutor whiter steer potter utter water watter teeter pewter wheatear zootier whitter daughter chatter dottier chattier petter chitter sheeter shooter pater shutter gater dieter better dotier guttery nuder pottery tooter haughtier rattier fattier putter miter littery titer tier rater neater noter suiter tear loiter matier rooter poutier jotter niter later pettier retear rioter knottier nitery cutter voter goutier footier beater toter lotter outre reutter patter battier hauteur netter baiter guttier phatter ruder metier cotter seater buttery bittier mater goiter bootery tottery eater mattery otter fitter hatter quitter meeter peatier cater vetter tater eatery cattier matter ruttier fetter hotter tatter feater ratter latter tetter rotter peter deter hooter puttier fatter tuatera lottery battery pitier writer vetoer mooter biter sitter knitter ritter batter powter whetter gnattier titter dotter uteri waiter watery doughtier sutra wetter natter jittery whitier wittier stere chattery doter cheater shatter shittier jettier dater yatter
tout touted tot tut louted tutted outthought totted outeat tooted outdo tauted outate stott outadd routed tutee tutu tutty tote toot toit taut outed pouted stot stout toited tutti toted tutued