Select the option that can be used as a one-word substitute for the given group of words.

A person who collects or studies stamps

Philatelist

The correct option is philatelist. It means "a person who collects or studies stamps." The other options are not correct substitutes.

• Numismatist is a person who collects or studies coins.
• Hoarder is a person who accumulates a large amount of things, often to an excessive degree.
• Collector is a person who collects things of a specified type, professionally or as a hobby.