watcher
/ˈwɒtʃər/Definitions
1. noun
One that watches; a person who observes or pays attention to something.
“The security watcher monitored the building’s CCTV footage.”
2. noun
A person or thing that is being watched or observed.
“The new TV series is a favorite among young watchers.”
3. verb
To keep watch over or observe something or someone.
“The mother watcher made sure her child was safe at the park.”