lookout

Short definition from Wiktionary

Noun

1. 1
   A vantage point with a view of the surrounding area.
2. 2
   A session of watching for an approaching enemy, police, etc.
3. 3
   A person on watch for approaching enemy, police, danger, etc.
4. 4
   A subject for observation; a prospect or view.
5. 5
   One's perspective, outlook; hence, one's responsibility. (used with a possessive pronoun or a noun in a possessive form).
6. 6
   An observation window.
7. 7
   A joist that extends in cantilever out from the exterior wall (or wall plate) of a building, supporting the roof sheathing and providing a nailing surface for the fascia boards.

Proper noun

1. 1
   A census-designated place in Modoc County, California, United States.