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.
citrus citrusy citrous citreous citers sitars ciders suitors sitters suiters stirs stars straws cyders strays ceders sutras stours stairs strows stress strews steers stares cedars stroys stores strass satyrs steres siddurs satires souters seaters stereos stoures storeys setters sataras sutures satirise sautoirs
citrus loiters satyrs mutters quitters letters daughters stars citers rotors routers niters titters putters pewters suiters nitros footers ratters outers knotters cuatros litres miters bettors fitters viators beaters fetors batters patters butyrous hooters teeters truss dotters noters baiters cotters caters petrous jitters betters tetris titers taters waiters cooters toters sutras whitters setters wetters cheaters oaters uterus shatters pouters shooters touters shutters quieters ritters boaters gators reutters quittors metres ottars goitres biters dieters sitters netters mooters lotters attars heaters meeters kiters haters matres guitars gaiters gaters torous gutters mitres tars foetors voters tors fetters torus litters peters getters tetras hydrous tatars nutters tres couters coaters eaters natters writers paters seaters knitters citrusy liters deters stirs citrous looters rotters nitres tooters raters potters suitors nitrous vetters retros petters cutters jotters butters rioters quoters metros otters goitrous bitters doters goiters souters motors maters trues hitters meters quatres hatters matters neuters rooters whetters druse titres tatters waters cottars totters daters chatters tetters sitars chitters odorous utters sheeters powters shouters tutors yatters