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