mountaineer
n.a person who climbs mountains for fun or as a job. You use this word for someone who enjoys the challenge of high-altitude climbing.
n.a person who climbs mountains, typically for recreation or as a professional pursuit. Often implies a level of technical skill and physical endurance beyond casual hiking.
“The experienced mountaineer reached the summit at dawn.”
“After years of training, she became a professional mountaineer specializing in high-altitude rescue operations.”
“The documentary follows a seasoned mountaineer as he navigates the treacherous crevasses of the Himalayas, documenting the physical and psychological toll of such an ascent.”
“The rock destabilization poses risks to mountaineers, and several climbers have died since the start of the summer season.”
“The bodies of two Belgian mountaineers who went missing in the Swiss Alps more than three decades ago have been found in a melting glacier.”
From mountain + -eer.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.