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.
chowder cheder chider chudder shoddier chador chadri shader chadar shedder shouter cheddar chuddar chatter shadier cheater chitter shooter shudder chattery chattier cheddary shoetree shuddery shatter sheeter shutter
powder chowder wider coder woodier wader dodder fodder voider hoodier codder lewder dowdier louder loader moodier nodder odder powdery powter rowdier bawdier