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.
foys foss fays fozy foes fosse fossa fossae fas fes fuss voes fees fess fuse foci feus fehs fyce vows fease fesse fezzy fizzy fusee fussy fuzzy
boys buoys foys hoys joys coys goys soys toys os