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"seabird" is also used as a crossword clue. If that's what you saw, the answer is often puffin (6 letters).
Definitions
a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc.
Word origin
From sea + bird.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Gull, for one”7 letters
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