Gatekeeper vs. Watchman

A person or group who controls access to something or somebody

A person who guards or monitors passage through a gate

A common orange and brown butterfly with eyespots, Pyronia tithonus, of the family Nymphalidae.

someone who controls access to something;

Example: ‘there are too many gatekepers between the field officers and the chief’;

someone who guards an entrance

A gatekeeper is a person who controls access to something, for example via a city gate or bouncer, or more abstractly, controls who is granted access to a category or status. Gatekeepers assess who is in the classic words of management scholar Kurt Lewin.Various figures in the religions and mythologies of the world serve as gatekeepers of paradisal or infernal realms, granting or denying access to these realms, depending on the credentials of those seeking entry.

Example: ‘in or out,’;

One set to watch; a person who keeps guard, especially one who guards a building, or the streets of a city, by night.

One set to watch; a person who keeps guard; a guard; a sentinel.

Specifically, one who guards a building, or the streets of a city, by night.

a guard who keeps watch