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"watcher" is also used as a crossword clue. If that's what you saw, the answer is often viewer (6 letters).
Definitions
a close observer; someone who looks at something (such as an exhibition of some kind)
Word origin
From Middle English wacchere, wachere, wacher, equivalent to watch + -er.
Used in a sentence
“Near-synonyms: watchman, watchwoman”
“the Book of Watchers”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Close observer”7 letters
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