rotor blade vs rotary wing

rotor blade and rotary wing both are nouns.

Word	Noun	Adjective	Verb	Adverb
rotor blade	Yes	No	No	No
rotary wing	Yes	No	No	No

As nouns, rotor blade and rotary wing are synonyms defined as:

rotor blade and rotary wing: the long airfoil that rotates to provide the lift that supports a helicopter in the air

rotor blade (noun)	rotary wing (noun)
the long airfoil that rotates to provide the lift that supports a helicopter in the air	the long airfoil that rotates to provide the lift that supports a helicopter in the air