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.
citrin citrine citron cittern strain stearin seatrain stearine stern cedarn sterna strewn strown sadiron styrene sauterne
citrin torn attorn turn biotron trine train turion pattern return retorn citrine outturn outran cittern neutrino stearin matron stern quatrain detrain butyrin uterine vitrine dourine drain patron gittern durian durion bittern taurine tern tarn pterin terrine retrain terrain citron outrun seatrain neutron stearine natron strain latrine diatron vitrain waitron