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.
harpy harp
harpy sharpy chirrupy crepy sharp chirpy harp carp carpi crappy ropy charpoy grapy gripy sirupy syrupy drapey tarp warp grapey
haar hair hairy hare harrow harry hear hoar hoary