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.
punny puny penny pinny pun puna pony piny penni piney peony pinna penna panne penne pinnae pennia pennae pen pin pan pawn pein peen pean pane pain pina pion pone peon poon pine pian
funny runny bunny sunny tunny gunny punny bunn sunna nanny fanny sonny ninny finny jenny wenny benny puny shinney johnny shanny annoy whinny hinny penny ginny tannoy bonny tinny fenny canny minny luny pinny sunn shinny