human race vs human being

human race and human being both are nouns.

Word	Noun	Adjective	Verb	Adverb
human race	Yes	No	No	No
human being	Yes	No	No	No

As nouns, human being is a hypernym of human race; that is, human being is a word with a broader meaning than human race:

human race: all of the living human inhabitants of the earth
human being: any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage

Other hypernyms of human race include group, grouping, homo, human, man.

human race (noun)	human being (noun)
all of the living human inhabitants of the earth	any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage