abstractionism vs abstract art

abstractionism and abstract art both are nouns.

Word	Noun	Adjective	Verb	Adverb
abstractionism	Yes	No	No	No
abstract art	Yes	No	No	No

As nouns, abstractionism and abstract art are synonyms defined as:

abstractionism and abstract art: an abstract genre of art; artistic content depends on internal form rather than pictorial representation

abstractionism (noun)	abstract art (noun)
an abstract genre of art; artistic content depends on internal form rather than pictorial representation	an abstract genre of art; artistic content depends on internal form rather than pictorial representation
a representation having no reference to concrete objects or specific examples