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"waterfowl" is also used as a crossword clue. If that's what you saw, the answer is often duck (4 letters).
Definitions
A water bird such as a duck or goose.
Word origin
From Middle English waterfoul, water-foul, equivalent to water + fowl. Compare Old English dopfugel (“waterfowl, moorhen”, literally “dipping-fowl”).
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Duck or goose”9 letters
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