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.
nauseous nauseas nouses noses gnoses nesses niseis noises nooses newsies naysays gneisses kneesies nazis nisus gnosis noesis
caseous gaseous nauseous osseous sous souse caseose masseuse paseos piceous poaceous reseaus rousseaus diseuse sos