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"lookout" is also used as a crossword clue. If that's what you saw, the answer is often spotter (7 letters).
Definitions
the act of looking out
Word origin
Deverbal from look out.
Used in a sentence
“We kept a lookout all night, but nobody came.”
“The raid failed when the lookout noticed the enemy group.”
“Every person's interest is his own lookout.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Watch point”7 letters
02“Watcher or viewpoint”7 letters
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