Explorer (noun)

1. A person who travels in order to gain knowledge of a place or region, especially one who is the first to visit a particular area.
2. A person who makes detailed examination or investigation.

Origin:

From middle english explorer, from old french explorer, from latin explōrātor, from explōrāre ("to explore, examin.e")

Examples:

1. Christopher Columbus was an explorer who discovered America.
2. He is a well-known explorer of the Amazon rainforest.
3. The explorer mapped the unknown territories.
4. The company sent an explorer to survey the area for potential oil reserves.
5. She is a pioneer explorer of the deep sea.