der Bergsteiger
mountaineer
A person who climbs mountains as a sport, hobby, or profession.
Ein erfahrener Bergsteiger führte die Gruppe sicher zum Gipfel.
An experienced mountaineer led the group safely to the summit.

mountaineer
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mountaineer
A person who climbs mountains as a sport, hobby, or profession.
Ein erfahrener Bergsteiger führte die Gruppe sicher zum Gipfel.
An experienced mountaineer led the group safely to the summit.

The word is a clear compound of 'der Berg' (mountain) and 'der Steiger' (climber/one who climbs). A 'Steiger' is a person who climbs, derived from the verb 'steigen' (to climb/rise). So a Bergsteiger is literally a 'mountain climber'.
Die Bergsteiger erreichten den Gipfel bei Sonnenaufgang.
The mountaineers reached the summit at sunrise.
'Der Bergsteiger' (the mountaineer) belongs to a word family. The activity itself is called 'bergsteigen' (to go mountaineering) or 'das Bergsteigen' (mountaineering). Knowing this family helps you understand related terms.
Er geht am liebsten in den Alpen bergsteigen.
He most enjoys going mountaineering in the Alps.
'Bergsteiger' (mountaineer) is often combined with adjectives that describe experience or professionalism. Typical examples are 'erfahrener Bergsteiger' (experienced mountaineer), 'professioneller Bergsteiger' (professional mountaineer), or 'mutiger Bergsteiger' (brave mountaineer).
Nur die besten Bergsteiger der Welt wagen sich an diesen Gipfel.
Only the best mountaineers in the world dare to attempt this summit.
hiker
'Wanderer' and 'Bergsteiger' can both be out in nature and in the mountains. A 'Wanderer' walks longer distances on foot, often on paths and for recreation. A 'Bergsteiger' climbs mountains and often needs more experience, equipment, or technique for that. The words can be confused because many hikes also take place in the mountains. If someone is walking along a path through the forest or mountains, you are more likely to say 'Wanderer'. If the goal is a summit and climbing the mountain is the main focus, 'Bergsteiger' fits better.

Bei starkem Wind wartet der Bergsteiger lieber, bevor er zum Gipfel weitergeht.
In strong wind, the mountaineer prefers to wait before continuing to the summit.
Auf dem breiten Waldweg kommen uns mehrere Wanderer entgegen.
Several hikers come toward us on the wide forest path.