measure word · a period of ten years, commonly used to describe a person's age

那位老教授已经年过八旬。

time word · a completed cycle or full duration of time, such as a full month or a full year

旬月之间，工程便已宣告竣工。

noun, measure word · a period of ten days, typically representing one-third of a lunar or solar month

根据规定，他每旬都要向总部汇报工作进度。