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.
evenness evens evanesce euphonies evince
vainness evenness toughness daffiness savviness roughness puffiness naiveness fannies fewness feyness finesse funnies beefiness heaviness highness huffiness iffiness goofiness leafiness liveness miffiness nighness rifeness safeness suaveness deafness waviness