acmeism vs art movement

acmeism and art movement both are nouns.

Word	Noun	Adjective	Verb	Adverb
acmeism	Yes	No	No	No
art movement	Yes	No	No	No

As nouns, art movement is a hypernym of acmeism; that is, art movement is a word with a broader meaning than acmeism:

acmeism: An early 20th-century Russian school of poetry that rejected the vagueness and emotionality of Symbolism in favor of Imagist clarity and texture.
art movement: a group of artists who agree on general principles

Other hypernyms of acmeism include artistic movement.

acmeism (noun)	art movement (noun)
An early 20th-century Russian school of poetry that rejected the vagueness and emotionality of Symbolism in favor of Imagist clarity and texture.	a group of artists who agree on general principles