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.
affairs affaires afars affrays aivers aviaries avers averse avarice
affairs fairs firs deifiers zaffirs suffaris safaris fares faros fears fiars fires vairs afars refires reifiers affaires sofars kaffirs zaffars kafirs defiers kefirs shofars