win back vs get

win back is not a noun while get is a noun.

Word	Noun	Adjective	Verb	Adverb
win back	No	No	Yes	No
get	Yes	No	Yes	No

As verbs, get is a hypernym of win back; that is, get is a word with a broader meaning than win back:

Other hypernyms of win back include acquire.

win back (noun)	get (noun)
	a return on a shot that seemed impossible to reach and would normally have resulted in a point for the opponent

win back (verb)	get (verb)
recover something or somebody that appeared to be lost	be stricken by an illness, fall victim to an illness
	come to have or undergo a change of (physical features and attributes)
	make (offspring) by reproduction
	undergo (as of injuries and illnesses)
	enter or assume a certain state or condition
	give certain properties to something
	cause to move; cause to be in a certain position or condition
	receive a specified treatment (abstract)
	take the first step or steps in carrying out an action
	reach by calculation
	grasp with the mind or develop an understanding of
	be a mystery or bewildering to
	cause to do; cause to act in a specified manner
	communicate with a place or person; establish communication with, as if by telephone
	move into a desired direction of discourse
	take vengeance on or get even
	attract and fix
	go or come after and bring or take back
	succeed in catching or seizing, especially after a chase
	reach with a blow or hit in a particular spot
	overcome or destroy
	earn or achieve a base by being walked by the pitcher
	apprehend and reproduce accurately
	evoke an emotional response
	irritate
	reach a destination; arrive by movement or progress
	reach and board
	leave immediately; used usually in the imperative form
	go through (mental or physical states or experiences)
	suffer from the receipt of
	perceive by hearing
	receive as a retribution or punishment
	come into the possession of something concrete or abstract
	achieve a point or goal
	purchase
	acquire as a result of some effort or action