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.
spurge sparge
purge spurge parge peerage cooperage sparge
spurrey spurry spur supra spar spare sparrow sparry spiraea spire spirea spore spray spree sprue spry spiry osprey