antiblack vs racist

antiblack is not a noun while racist is a noun.

Word	Noun	Adjective	Verb	Adverb
antiblack	No	Yes	No	No
racist	Yes	Yes	No	No

As adjectives, antiblack and racist are synonyms defined as:

antiblack and racist: discriminatory especially on the basis of race or religion

Other synonyms of antiblack include anti-Semite.

antiblack (noun)	racist (noun)
	a person with a prejudiced belief that one racial group is superior to others

antiblack (adjective)	racist (adjective)
discriminatory especially on the basis of race or religion	discriminatory especially on the basis of race or religion
	based on racial intolerance