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"goodbye" is also used as a crossword clue. If that's what you saw, the answer is often farewell (8 letters).
Definitions
Farewell said when leaving or ending a conversation.
Word origin
From earlier goodby, Godby, Godby'e, Godbwye, God b'w'y, God bwy yee, God buy you, God be wi' you, each a progressively shorter contraction of God be with ye or God be with you. Note the change of God to good by confusion with good morning, good night, etc. Modernly analysed as good + bye.
Used in a sentence
“Goodbye! - Goodbye, Anna.”
“They made their good-byes.”
“We have time for a short goodbye.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Parting word”7 letters
02“Farewell”7 letters
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