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