鼻尖 =
鼻 ('nose') +
尖 ('tip/point'). The most common collocations describe physical states of the nose tip — turning red from cold (
冻红了), beading with sweat, or pressing against a window. Fixed expression:
鼻尖上的汗 ('sweat on the tip of the nose'), often used to convey hard work or tense effort.