abstract art vs abstractionism

abstract art and abstractionism both are nouns.

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

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

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

abstract art (noun)	abstractionism (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