substituteguard

noun
UK /ˈsʌbstɪtjuːtɡɑːd/
US /ˈsʌbstɪtuːtɡɑːrd/

A substituteguard is a person who stands in for a guard when the real guard cannot be there.

The substituteguard watched the gate while the regular guard took a break.


OTHER MEANINGS

2. A temporary guard assigned to cover another guard's shift.

The substituteguard covered the night shift when the usual guard was sick.

3. A backup protector who takes over when the main guard is away.

The substituteguard stepped in when the main guard went home early.

4. A person who fills in for a guard during an emergency.

During the storm, a substituteguard was called in to watch the entrance.