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.
wooer weer wore were wear weir whore worry where weary wherry war wair ware wary waur whir wire wiry
wooer cooer boor hoer goer gooier moor moory poor poori zooier doer door shoer