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.
dour doura dor dourah doer durr dure dore tour dory dorr door dura duro durra doughier dowry durrie dry tor tore toro dere tory dree tora dear dray dire tori deer dare draw torr drew deair deary hydro dairy torah torii deray derry diary hydra
four hour giaour lour our pour sour dour tour your or
dough doughy dought doughty do