Sentence:  As for the night being warm , he would have been comfortable naked on <WSD>Mount</WSD> Everest but his water brothers had little tolerance for changes in temperature and pressure ; he was considerate of their weakness , once he learned of it . 
Meaning of the word marked with <WSD> tags:  a mountain in the central Himalayas on the border of Tibet and Nepal; the highest mountain peak in the world (29,028 feet high)