mountaineer

Short definition from Wiktionary

Noun

1. 1
   A person who lives in a mountainous area (often with the connotation that such people are outlaws or uncivilized).
2. 2
   A person who climbs mountains for sport or pleasure.
3. 3
   An animal or plant that is native to a mountainous area.
4. 4
   A bird of the genus Oreonympha; also called the bearded mountaineer or eastern mountaineer

Verb

1. 1
   To climb mountains; to climb using the techniques of a mountaineer.
2. 2
   To climb as if on a mountain.