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.
uptear uptore updry
uptear pater chapiter diptera sputtery spouter spotter spatter repeater copter puttier putter powter poutier pouter pottier potter patter pitier pewter pettier petter peter peatier apter puppeteer scepter spitter spottier sputter diopter pottery chapter