Watcher

Noun

1. Someone who watches or observes. Someone who observes something closely for professional reasons, such as an analyst or pundit. A political representative aligned with a candidate sent to observe elections to report on irregularities. A scrutineer.
2. Someone who observes something closely for professional reasons, such as an analyst or pundit.
3. A political representative aligned with a candidate sent to observe elections to report on irregularities. A scrutineer.
4. Someone who keeps vigil.
5. A guard.