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.
what wheat wat wait watt whet whit whity white whydah whitey whidah wet wit wot wad wade wadi wady weet whid wite woad waddy witty
ghat phat hat what chat shat at