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.
outrows outthrows outers outraise oaters odours ottars otters outrace odors odorous
trows strows outrows outthrows heteros nitroso tyros nitrous nitros metros goitrous cuatros trois straws drowse drowsy trews toros tiros taros troys petrous citrous strews trios retros stroys