stage business vs acting

stage business and acting both are nouns.

Word	Noun	Adjective	Verb	Adverb
stage business	Yes	No	No	No
acting	Yes	Yes	No	No

As nouns, acting is a hypernym of stage business; that is, acting is a word with a broader meaning than stage business:

stage business: incidental activity performed by an actor for dramatic effect
acting: the performance of a part or role in a drama

Other hypernyms of stage business include performing, playacting, playing.

stage business (noun)	acting (noun)
incidental activity performed by an actor for dramatic effect	the performance of a part or role in a drama

stage business (adjective)	acting (adjective)
	serving temporarily especially as a substitute