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.
touch touchy touche teuch douche tosh tush tech tach techy ditch duchy dutch teach tache tushy datcha techie tetchy tushie toeshoe
couch vouch pouch touch ouch mouch cutch hotch gaucho boche mocha mutch notch hutch poach touche pooch hootch rouche sauch douche dutch gauche touchy sheuch teuch choush butch mucho much loach louche mooch heuch loch roach hooch nautch coach botch pouchy rotch ruche such duchy chough nucha cooch yuch