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.
mishear masher mosher musher meshier mushier matcher moocher machree
shear mishear cashier cosher cushier gusher kasher quasher josher lusher meshier mosher masher mushier pisher pusher rasher rushier dashier tushery washer wisher fishery fishier bushier fisher busher share basher ashier shoer shier lasher sheer gasher kosher gushier musher nosher posher pushier rusher dasher dishier usher washier shusher