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.
cochair coacher coucher catchier cosher cashier catcher cushier cutchery guacharo kosher gaucher gushier
cochair chair char guacharo witchier chare tetchier charr reechier chary poachier chiro peachier chirr mouchoir chiru achier beachier beechier bitchier botchier itchier catchier choir leachier patchier pitchier pouchier techier touchier chichier