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.
quasher gasher gusher kasher cushier cashier gushier cosher kosher coacher coucher gaucher catcher catchier cutchery guacharo gaucherie
basher masher washer lasher dasher rasher gasher quasher kasher gushier lusher shier nosher gusher busher posher bushier cosher shear kosher meshier rushier fishier rusher dishier reacher dashier wisher musher poacher leacher pushier coacher pusher shoer josher mushier fisher mosher pisher teacher tushery cushier peacher mishear ashier sheer cashier fishery washier usher shusher