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.
johnny john johnnie jenny jeon jinn join ginny jinni jinnee jin jun
johnny finny shinny shanny whinny tunny tannoy sonny punny penny nanny benny bonny bunny fanny fenny annoy phony pinny shinney whiny wenny tinny sunny runny ninny funny minny gunny canny jenny ginny hinny shiny