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"wow" is also used as a crossword clue. If that's what you saw, the answer is often amaze (5 letters).
Definitions
Exclamation of amazement; also to impress greatly.
Word origin
Attested since the 16th century; borrowed from Scots wow; ultimately a natural exclamation.
Used in a sentence
“Wow, I sure was surprised!”
“Out on thir wanderand spiritis, wow! thow cryis.”
“Wow! How do they do that?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer4 curated clues
01“Amazed reaction”3 letters
02“Amazement cry”3 letters
03“Stunned response”3 letters
04“Amazed exclamation”3 letters
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