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.
zooier zero zori sieur zaire sierra soiree zoaria ser sir
gooier zooier shier wooer doughier bier sieur fiery vier hoer coir cooer goer lier kier moira moire noir oorie pier wrier doer tier choir shoer