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.
usher
basher kosher gasher pusher wisher mosher busher lasher usher nosher rusher washer quasher shusher gusher kasher pisher josher cosher lusher rasher musher posher masher dasher fisher sheer ocher matcher coucher mushier leachier itchier dishier shoer notcher meshier fishery cashier leacher fetcher cutchery bushier pouchier ochery botchery chichier witchery beechier tushery toucher tetchier teacher patchier pitchier beachier echoer shier voucher peacher hatchery lechery rushier pitcher hitcher moocher techier bitchier peachier mishear fishier botcher cheer poacher ashier tocher gushier catcher gaucher butchery shear batcher butcher dashier coacher achier botchier watcher reechier patcher catchier richer cushier reacher bitchery hatcher shri pushier touchier lecher washier poachier etcher witchier ditcher