rotor blade vs control surface

rotor blade and control surface both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotor blade	Yes	No	No	No
control surface	Yes	No	No	No

As nouns, control surface is a hypernym of rotor blade; that is, control surface is a word with a broader meaning than rotor blade:

rotor blade: the long airfoil that rotates to provide the lift that supports a helicopter in the air
control surface: 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 rotor blade include aerofoil, airfoil, surface.

rotor blade (noun)	control surface (noun)
the long airfoil that rotates to provide the lift that supports a helicopter in the air	a device that provides reactive force when in motion relative to the surrounding air; can lift or control a plane in flight