segregationist vs segregator

segregationist and segregator both are nouns.

Word	Noun	Adjective	Verb	Adverb
segregationist	Yes	No	No	No
segregator	Yes	No	No	No

As nouns, segregationist and segregator are synonyms defined as:

segregationist and segregator: someone who believes the racial groups should be kept apart

segregationist (noun)	segregator (noun)
someone who believes the racial groups should be kept apart	someone who believes the racial groups should be kept apart