hypsometry vs mensuration

hypsometry and mensuration both are nouns.

Word	Noun	Adjective	Verb	Adverb
hypsometry	Yes	No	No	No
mensuration	Yes	No	No	No

As nouns, mensuration is a hypernym of hypsometry; that is, mensuration is a word with a broader meaning than hypsometry:

hypsometry: measurement of the elevation of land above sea level
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of hypsometry include measure, measurement, measuring.

hypsometry (noun)	mensuration (noun)
measurement of the elevation of land above sea level	the act or process of assigning numbers to phenomena according to a rule