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.
spatter spitter spotter sputter spottier sputtery spader scepter spouter spider sceptre speeder spidery spudder septaria speedier
spatter patter sputtery spottier spotter spitter repeater apter puttier putter pottier pottery potter pettier petter peatier pater sputter chapter