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"thought" is also used as a crossword clue. If that's what you saw, the answer is often idea (4 letters).
Definitions
An idea or act of thinking
Used in a sentence
“The greatest weapon against stress is our ability to choose one thought over another.”
“I hate the thought of going back to work Monday morning.”
“Without freedom of thought there can be no such thing as wisdom, and no such thing as public liberty without freedom of speech.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Mental idea”7 letters
02“Idea in the mind”7 letters
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