flaps vs airfoil

flaps and airfoil both are nouns.

Word	Noun	Adjective	Verb	Adverb
flaps	Yes	No	No	No
airfoil	Yes	No	No	No

As nouns, airfoil is a hypernym of flaps; that is, airfoil is a word with a broader meaning than flaps:

flaps: a movable airfoil that is part of an aircraft wing; used to increase lift or drag
airfoil: a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight

Other hypernyms of flaps include aerofoil, control surface, surface.

flaps (noun)	airfoil (noun)
a movable airfoil that is part of an aircraft wing; used to increase lift or drag	a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight