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.
cottars cotters cottiers couters cutters cooters coaters catarrhs coteries coutures catteries caters coders cadres guitars goiters codders gutters goitres quoters cateress goitrous quitters quittors cauteries gaters gators kiters cuatros gadders gaiters gaydars quatres
cottars attars ottars tars hitters matters litters quittors gutters betters quitters taros cutters bitters tarsi tears batters tahrs natters tatars petters stairs shutters putters retears ritters sataras sitars knitters otters stars tetters totters utters wheatears whitters chitters nutters tares vetters patters bettors fitters butters jitters cotters knotters fetters jotters letters hatters lotters getters mutters potters guitars tatters shatters chatters whetters wetters tuataras titters dotters netters stares sitters setters rotters reutters ratters yatters