imperialism vs imperialistic

imperialism is a noun but imperialistic is not a noun.

Word	Noun	Adjective	Verb	Adverb
imperialism	Yes	No	No	No
imperialistic	No	Yes	No	No

imperialism (noun)	imperialistic (noun)
any instance of aggressive extension of authority
a political orientation that advocates imperial interests
a policy of extending your rule over foreign countries

imperialism (adjective)	imperialistic (adjective)
	of or relating to imperialism