This is the 7228th most frequent Catalan word.
alpinista
A mountaineer or climber of high mountains.
The word 'alpinista' here refers to a person engaging in the activity (noun in subject role).
L'alpinista va escalar la muntanya més alta del país.
The mountaineer climbed the highest mountain in the country.
The term 'alpinistes' is used in its plural form to denote people sharing the characteristic of engaging in mountaineering.
Han obert una nova botiga especialitzada en equipament per a alpinistes.
They have opened a new store specializing in equipment for mountaineers.
'Alpinistes' is descriptive here, categorizing the individuals as practitioners of mountaineering.