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.
safeness suaveness savviness savines sphenes saphenas saphenous savins sevens savannas savannahs
liveness naiveness suaveness rifeness safeness huffiness vainness finesse feyness puffiness heaviness sphenes nighness daffiness iffiness toughness venues revenues evenness avenues highness fewness roughness caffeines miffiness savviness leafiness goofiness deafness beefiness waviness