mankind vs human race

mankind and human race both are nouns.

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

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

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

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

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