hypsography vs mensuration

hypsography and mensuration both are nouns.

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

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

hypsography: 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 hypsography include measure, measurement, measuring.

hypsography (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
the scientific study of the earth's configuration above sea level (emphasizing the measurement of land altitudes relative to sea level)