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.
powdery powder powter poetry pottery potter pouter padder pewter pottier poutier padre padri pater peter patter petter pitier putter peatier pettier puttier
powdery powder chowder wader tawdry dowdier doddery rudery deary rowdier lewder gaudery bawdry bawdier derry deray wider shuddery dry