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.
chaff chaffy chafe chuff chuffy chef chief chufa sheaf
chaff aff sheaf chaffy whiff piaffe chafe waff taffy daffy daff raff quaff baffy gaffe baff gaff caff huff haaf naff chuff yaff
chai chao chaw chay chia chiao