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.
hoer her hear heir hour here hora hoar hero houri horah herry hoary hoorah hooray haar hair hare hire hairy harry hiree hurry
hoer cooer goer doer wooer shoer er or