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.
pedro padri pater peter padre putter potter poetry pitier pewter petter padder pouter powder powter patter peatier pettier pottery pottier poutier powdery puttier
pedro duro weeder seeder hydro feeder heder heeder hetero lieder maduro metro needer redry retro cedar ceder seder stereo cheder