segregationism vs ideology

segregationism and ideology both are nouns.

Word	Noun	Adjective	Verb	Adverb
segregationism	Yes	No	No	No
ideology	Yes	No	No	No

As nouns, ideology is a hypernym of segregationism; that is, ideology is a word with a broader meaning than segregationism:

segregationism: a political orientation favoring political or racial segregation
ideology: an orientation that characterizes the thinking of a group or nation

Other hypernyms of segregationism include political orientation, political theory.

segregationism (noun)	ideology (noun)
a political orientation favoring political or racial segregation	an orientation that characterizes the thinking of a group or nation
	imaginary or visionary theorization