whipping boy vs victim

whipping boy and victim both are nouns.

Word	Noun	Adjective	Verb	Adverb
whipping boy	Yes	No	No	No
victim	Yes	No	No	No

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

whipping boy (noun)	victim (noun)
someone who is punished for the errors of others	an unfortunate person who suffers from some adverse circumstance
	a person who is tricked or swindled