art deco vs art movement

art deco and art movement both are nouns.

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

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

art deco: a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production
art movement: a group of artists who agree on general principles

Other hypernyms of art deco include artistic movement.

art deco (noun)	art movement (noun)
a style of design that was popular in the 1920s and 1930s; marked by stylized forms and geometric designs adapted to mass production	a group of artists who agree on general principles