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.
nitros nitrous nitroso niters nitres knitters niteries noters nadirs natters nutrias neuters natures netters nutters knotters notorious needers nodders kneaders notaries
cuatros metros nitros retros bitters cooters caters rioters letters maters foetors butters voters lotters quittors natters doters tars nitres stars fetters citrous duros goitres nitroso shooters cheaters torose oaters cotters noters jitters meters tors rotters gators hooters wetters tatters ottars matters bettors hatters vetters loiters stroys potters powters shutters shatters satyrs writers rooters baiters knitters tatars waiters sitters petters litres peters fetors patters stirs deters tetras totters whitters raters titres tetters outers hydrous eaters neuters outthrows setters hydros suitors tyros taros tiros quieters gaiters guitars daters kiters motors trios tooters toros mitres tutors torous titers suiters maduros biters niters batters litters butyrous routers chitters viators whetters teeters pewters boaters outrows attars pedros nitrous coaters quoters quatres trois meeters tres heteros mutters citrus beaters hitters fitters putters odorous dotters couters petrous goiters jotters ratters quitters gutters betters miters shouters utters paters cottars getters trows netters sitars gaters sutras stereos liters ritters heaters cutters footers daughters looters haters pouters toters mooters matres titters knotters goitrous seaters citers rotors reutters troys taters waters souters sheeters otters nutters dross metres strows dieters tetris touters chatters yatters
nitre nitro knitter niter niterie nitery nittier nutria antra antre entree entry intro unitary uniter untrue