human race vs mankind

human race and mankind both are nouns.

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

As nouns, human race and mankind are synonyms defined as:

human race and mankind: all of the living human inhabitants of the earth

Other synonyms of human race include human beings, humanity, humankind, humans, man, world.

human race (noun)	mankind (noun)
all of the living human inhabitants of the earth	all of the living human inhabitants of the earth