rotary wing vs rotor blade

rotary wing and rotor blade both are nouns.

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

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

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

rotary wing (noun)	rotor blade (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