human beings vs humanity

human beings and humanity both are nouns.

Word	Noun	Adjective	Verb	Adverb
human beings	Yes	No	No	No
humanity	Yes	No	No	No

As nouns, human beings and humanity are synonyms defined as:

human beings and humanity: all of the living human inhabitants of the earth

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

human beings (noun)	humanity (noun)
all of the living human inhabitants of the earth	all of the living human inhabitants of the earth
	the quality of being humane
	the quality of being human