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"bowfin" is also used as a crossword clue. If that's what you saw, the answer is often grindle (7 letters).
Definitions
A primitive freshwater fish of eastern North America.
Word origin
From bow + fin.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Freshwater swimmer”6 letters
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