Select the most appropriate one-word substitution for the given group of words.

A person collecting and dealing in antique things or study them. 

Antiquarian

The most appropriate one-word substitution for the given group of words is antiquarian.

• Antiquarian means a person who collects and deals in antique things or studies them.
• Librarian means a person who is in charge of a library and its collection of books.
• Aquarium means a building or tank where fish and other aquatic animals are kept for display.
• Antiquity means the time of the ancients or the ancient world.