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.
hyaenas hyenas yens yawns yeans yuans yins yonis
hyaenas faenas anas lanais cannas goannas guanase guanays kanas mannas manas paeans ruanas scenas siennas hennas genoas veenas duennas saunas tenias whenas taenias xenias sennas paeons faunas nanas manias lianas annas anoas aeons hyenas ens