imagism vs artistic movement

imagism and artistic movement both are nouns.

Word	Noun	Adjective	Verb	Adverb
imagism	Yes	No	No	No
artistic movement	Yes	No	No	No

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

imagism: a movement by American and English poets early in the 20th century in reaction to Victorian sentimentality; used common speech in free verse with clear concrete imagery
artistic movement: a group of artists who agree on general principles

Other hypernyms of imagism include art movement.

imagism (noun)	artistic movement (noun)
a movement by American and English poets early in the 20th century in reaction to Victorian sentimentality; used common speech in free verse with clear concrete imagery	a group of artists who agree on general principles