One-word substitution (vocabulary): A person interested in collecting, studying, and selling old things Select the single best word that matches the description.

Given data

• Description: someone who collects, studies, and often trades in old/rare objects.

Concept/Approach
Distinguish between scholarly interest in antiques vs. general dealing or unrelated traits.

Reasoning through options
Antiquarian — a student/collector of antiques and rare objects; often buys/sells them. Correct. Junk-dealer — trades in discarded items of little value; not focused on historical/rare objects. Archaeologist — scientifically studies past human life via excavation; not defined by collecting/selling objects. Crank — eccentric person; irrelevant.

Common pitfalls
Equating archaeology (a scientific field) with antique trading or private collecting.