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.
haafs hafiz haves hoofs howfs huffs heaves howffs heavies
haafs kafs sheafs chafes waffs safes oafs naffs loafs leafs lavas quaffs kavas kaifs guavas baffs gaffs caffs cafes javas favas naifs raffs daffs waifs chaffs yaffs