Definition:
"Human beings" refers to all the people in the world. It is a way to talk about the species of people who live on Earth.
Humankind: This term is often used interchangeably with "human beings" and emphasizes the collective nature of all humans.
Mankind: Traditionally used to refer to all humans, though it is becoming less common due to its male-centric implication.
"To be only human": This idiom means to make mistakes or show weaknesses, as all humans do.
"Human nature": This phrase refers to the inherent characteristics and instincts of humans.
"Human beings" is a term used to describe all people living on Earth. It emphasizes our shared characteristics and experiences.