punching bag vs victim

punching bag and victim both are nouns.

Word	Noun	Adjective	Verb	Adverb
punching bag	Yes	No	No	No
victim	Yes	No	No	No

As nouns, victim is a hypernym of punching bag; that is, victim is a word with a broader meaning than punching bag:

punching bag (noun)	victim (noun)
an inflated ball or bag that is suspended and punched for training in boxing	an unfortunate person who suffers from some adverse circumstance
a person on whom another person vents their anger	a person who is tricked or swindled