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.
sheafs sheaves chefs chafes chaffs chiefs shaves shivas shives shoves shavies sheeves shivahs shivs chuffs chevies
leafs sheafs efs baffs kefs quaffs foveas fiefs kiefs oafs reefs reifs beefs seifs defis teffs waffs chafes chefs loafs keefs naifs fease naffs effs neifs cafes caffs gaffs kafs kaifs jefes haafs jiveass raffs refs safes daffs devas uveas waifs chaffs chiefs yaffs
sheaf sheave shave shavie sheeve schav