spatialism vs art movement

spatialism and art movement both are nouns.

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

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

spatialism: an art movement founded by Italian artist Lucio Fontana in Milan in 1947 in which he intended to synthesize colour, sound, space, movement, and time into a new type of art.
art movement: a group of artists who agree on general principles

Other hypernyms of spatialism include artistic movement.

spatialism (noun)	art movement (noun)
an art movement founded by Italian artist Lucio Fontana in Milan in 1947 in which he intended to synthesize colour, sound, space, movement, and time into a new type of art.	a group of artists who agree on general principles