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.
whereto whereat wert whort wherried weirdo whored wearied weirdie whirred wart wort wared warty weird wired waired warred weirdy worrit
hereto whereto beret ferret hereat teredo terete terret whereat ret