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.
doughs douse dos dahs does dose doss dows dues duos douce dowse touse dis
boughs haughs heughs doughs choughs shaughs sheughs ghis
dough doughy dought doughty boughed bought