blame game vs accusation

blame game and accusation both are nouns.

Word	Noun	Adjective	Verb	Adverb
blame game	Yes	No	No	No
accusation	Yes	No	No	No

As nouns, accusation is a hypernym of blame game; that is, accusation is a word with a broader meaning than blame game:

blame game: accusations exchanged among people who refuse to accept sole responsibility for some undesirable event
accusation: a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt

Other hypernyms of blame game include accusal.

blame game (noun)	accusation (noun)
accusations exchanged among people who refuse to accept sole responsibility for some undesirable event	a formal charge of wrongdoing brought against a person; the act of imputing blame or guilt
	an assertion that someone is guilty of a fault or offence