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.
door dor doer dour dore dory dorr dowry doura dourah tor dry dree dear toro dure tory tori dere dray deer draw dare tore drew dire dura tour durr torr tora duro doughier dairy deray derry diary deary durra torii hydro deair torah hydra