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.
guitars gutters goitres gaiters guiders goiters quieters quittors quitters goitrous gaters kiters gators gadders gaydars cutters cottars cuatros quatres couters quoters catarrhs coutures gauderies cadres caters coaters cooters cotters kidders
guitars sitars tars tares loiters stares biters ottars nitres mitres taros tarsi liters tears attars tahrs suiters tatars titres waiters writers baiters cottars sataras titers goiters nitros stars stairs citrus gaiters suitors citers tuataras niters retears miters litres lidars kiters goitres wheatears