racial extermination vs genocide

racial extermination and genocide both are nouns.

Word	Noun	Adjective	Verb	Adverb
racial extermination	Yes	No	No	No
genocide	Yes	No	No	No

As nouns, racial extermination and genocide are synonyms defined as:

racial extermination and genocide: systematic killing of a racial or cultural group

Other synonyms of racial extermination include race murder.

racial extermination (noun)	genocide (noun)
systematic killing of a racial or cultural group	systematic killing of a racial or cultural group