tonometry vs mensuration

tonometry and mensuration both are nouns.

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

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

tonometry: the measurement of intraocular pressure by determining the amount of force needed to make a slight indentation in the cornea
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of tonometry include measure, measurement, measuring.

tonometry (noun)	mensuration (noun)
the measurement of intraocular pressure by determining the amount of force needed to make a slight indentation in the cornea	the act or process of assigning numbers to phenomena according to a rule