This is the 12995th most frequent German word.
zweitausendern
"Zweitausendern" refers to mountains that are at least 2,000 meters high.
Here, 'Zweitausender' refers to mountains that are over 2000 meters high.
Ich freue mich darauf, dieses Jahr viele Zweitausender zu besteigen.
I am looking forward to climbing many two-thousanders this year.
In this example, 'Zweitausender' is used as a plural noun to describe a category of mountains.
Die Alpen sind bekannt für ihre beeindruckenden Zweitausender.
The Alps are known for their impressive two-thousanders.
Here, the word is used metaphorically, referring to spending a night at a high-altitude location, common for climbers.