expressionist vs expressionism

expressionist and expressionism both are nouns.

Word	Noun	Adjective	Verb	Adverb
expressionist	Yes	Yes	No	No
expressionism	Yes	No	No	No

expressionist (noun)	expressionism (noun)
an artist who is an adherent of expressionism	an art movement early in the 20th century; the artist's subjective expression of inner experiences was emphasized; an inner feeling was expressed through a distorted rendition of reality

expressionist (adjective)	expressionism (adjective)
of or relating to expressionism