human beings vs humans

human beings and humans both are nouns.

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

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

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

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

human beings (noun)	humans (noun)
all of the living human inhabitants of the earth	all of the living human inhabitants of the earth