One who collects coins as hobby :

One who collects coins as hobby : Correct Answer Numismatist

One word substitute is Numismatist


Philatelist: a person who collects or studies stamps.
Ornithologist: a person who studies or is an expert on birds.
Statistician: an expert in the preparation and analysis of statistics.
Numismatist: someone who studies or collects coins, paper money, or medals.

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A person who collects coins