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.
iffiness
heaviness goofiness huffiness daffiness miffiness waviness iffiness savviness beefiness puffiness leafiness toughness savines caffeines finesse bovines liveness dauphines highness roughness vines defines feyness refines safeness naiveness fewness divines vainness fines rifeness deafness nighness ovines affines evenness ravines suaveness