outlooker
/ˈaʊtˌlʊkər/Definitions
1. noun
A person who looks out or has a particular viewpoint, especially one with a wide or general perspective.
“She was a keen outlooker who always tried to see the bigger picture.”
2. noun
A person who is employed to watch or monitor something from a particular point or vantage point, especially a building or area.
“The security team included several outlookers who watched the perimeter of the building.”