Monger (noun)

A dealer or trader in a specific commodity or service, often with a negative connotation.

Origin:

From middle english monger, probably from middle english mangeour ("trader"), from mange ("to trade"), of uncertain origin.

Examples:

1. He is a warmonger who profits from the sale of weapons.
2. She is a scandalmonger who spreads rumors and gossip.
3. The fishmonger sells fresh fish at the market.
4. The war-monger is eager to start a new conflict.
5. The rumor-monger spread false information about the politician.