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"trader" is also used as a crossword clue. If that's what you saw, the answer is often merchant (8 letters).
Definitions
someone who purchases and maintains an inventory of goods to be sold
Word origin
From trade + -er.
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Buyer and seller”6 letters
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