isolationistic vs isolationist

isolationistic is not a noun while isolationist is a noun.

Word	Noun	Adjective	Verb	Adverb
isolationistic	No	Yes	No	No
isolationist	Yes	Yes	No	No

As adjectives, isolationistic and isolationist are synonyms defined as:

isolationistic (noun)	isolationist (noun)
	an advocate of isolationism in international affairs

isolationistic (adjective)	isolationist (adjective)
of or relating to isolationism	of or relating to isolationism