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.
wenny weeny wen whinny wean winy when ween wany whiny waney winey wheen winnow wienie whiney weenie wan win won hwan wain wane whin wine wino
benny fenny penny wenny jenny meany penne deny sonny senna meiny punny funny fanny henna peony penni ginny penna hinny nanny weeny whinny sheeney shinney tannoy canny teeny veiny finny minny sunny sienna runny gunny pinny bunny tinny johnny tunny ninny annoy benne benni bonny duenna shanny sheeny shinny