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.
penni pennia penny penne penna pen pennae peen peon pein pean panne pinna punny pinny paean paeon peony pinnae pin pun pan hyponoia pine pawn puna pain poon pane pone piny pina pion pony pian puny
benni penni wienie weenie taenia deni xenia senna pennia penna jenny penne nannie hymenia cannie johnnie genie jinni benny henna benne fenny ennui bonnie biennia genii penny sienna zinnia duenna tenia wenny sheenie