a grave: the place where a dead body is laid to rest
This is the ordinary word for the place a body goes when someone dies. It covers any form that place might take in the ancient world: a hole dug in the ground, a natural cave, or a chamber cut into rock. The same word names the single resting spot of one person, the shared plot where a whole family is gathered, and, in poetry, the grave imagined as the silent destination of all the dead.
The senses below are not different words but the one idea seen from different distances. Up close it is a particular tomb that a particular person owns, buys, or is laid in. Stepped back, it is the family burial ground where the generations are gathered together, which is why kings are so often said to be buried (or denied burial) with their fathers. Widened all the way out, it becomes a picture of death itself, the place that swallows everyone and from which, in a few hopeful texts, God promises to bring his people back up.
The word carries weight far beyond real estate. In Israel a proper grave among one's own people was a mark of honor and belonging, and being left unburied was a horror and a curse. So the choice of word often signals not just where a body lies but whether a person died in peace and was received by their kin or was shamed even in death.