humankind vs human race

humankind and human race both are nouns.

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

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

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

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

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