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.
odour odor odder outer outre outrow outthrew outthrow
dour odour dor faitour watthour boudoir sudor adore stoure tour siddur moidore durr odor maduro dure duro fedora doura dory dorr dore door doer dura stour stoury detour chador