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.
chafe chaff chaffy chef chevy chief chive chufa chuff shave sheaf chuffy shavie sheave
chafe hyphae haaf have cafe gaffe piaffe raphae safe chaff shave sheaf
chai chao chaw chay chia chiao