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.
naysays nauseas nauseous nazis nisus noses gnoses gnosis nesses niseis noesis noises nooses nouses newsies
naysays says assays bioassays essays lyssas missays resays