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.
spurry spurrey sparry spry spur spiry spray sapour sparrow spar spoor speir spare sprue sopor sapor spire spore spier speer supra spree super spear spirea sipper sapper supper soaper sappier seepier soapier soppier soupier spiraea sapphire
spurry parry perry purr vapoury sparry spurrey