disappoint vs foil

disappoint is not a noun while foil is a noun.

Word	Noun	Adjective	Verb	Adverb
disappoint	No	No	Yes	No
foil	Yes	No	Yes	No

As verbs, foil is a hypernym of disappoint; that is, foil is a word with a broader meaning than disappoint:

Other hypernyms of disappoint include baffle, bilk, cross, frustrate, queer, scotch, spoil, thwart.

disappoint (noun)	foil (noun)
	a light slender flexible sword tipped by a button
	a piece of thin and flexible sheet metal
	picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
	a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
	anything that serves by contrast to call attention to another thing's good qualities

disappoint (verb)	foil (verb)
fail to meet the hopes or expectations of	cover or back with foil
	hinder or prevent (the efforts, plans, or desires) of
	enhance by contrast