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.
which wich whish witch witchy watch whoosh wash wish
which ich witch whish seiche vichy ditch rich niche bitch fiche fichu fitch hitch pitch quaich itch quiche quitch laich lich lichi miche aitch wich chichi