humankind: the human being as a creature of the ground, used both for people as a whole and for any single person
This is the Bible's basic word for a human, and it names the species before it ever names a man. It works first as a collective, like the English word "humanity" or the older sense of "man," naming people as a kind rather than one named individual. It has no plural and no female form: it covers male and female together as one creature. From there it narrows easily to any single person, whoever they are, and only late and unevenly does it harden into the personal name of the first human, Adam.
The word is tied to the ground. In the creation account the human (adam) is shaped from the dust of the ground (adamah), and the two words sound almost the same on purpose. Most scholars treat that link as a deliberate play on words rather than the word's actual origin, but the effect is the same either way: this is the earthbound, mortal creature, made by God and answerable to God, set apart from the animals yet never confused with God. The keynote the word strikes is creatureliness, not divinity.
Because it covers so much, the word leans on context. In legal and ritual texts it simply means a person, anyone at all. In the wisdom and poetry books it often carries the weight of human frailty and limits over against God, and Ecclesiastes returns to it again and again as the word for the mortal who shares the fate of the beasts. And as a form of address to the prophet Ezekiel, "son of man" simply means "mortal" or "human one," underlining the prophet's smallness before the God who speaks to him.