humanity vs human beings

humanity and human beings both are nouns.

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

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

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

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

humanity (noun)	human beings (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