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.
troupe trope trop towrope drupe tripe troop drop tarp trap trip drape droop drapey droopy trippy
croupe troupe towrope drupe pyrope hyperope liriope groupie grope group croupy croup rupee roupy roup ropey trope rope
taro router stroy strow stoury stourie stoure stour tyro tiro true troy trow trio tour toro touter