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