Watcher

Daniel 4:13,17,23, a figurative designation of heavenly beings, apparently angels, as seen by Nebuchadnezzar in his dream.

Source: ATS Bible Dictionary
Watcher

WATCHER, n.

1. One who sits up or continues awake; particularly, one who attends upon the sick during the night.
2. A diligent observer; as an attentive watcher of the works of nature. Not in use.
Source: King James Dictionary