actinometry vs mensuration

actinometry and mensuration both are nouns.

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

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

actinometry: measuring the intensity of electromagnetic radiation (especially of the sun's rays)
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of actinometry include measure, measurement, measuring.

actinometry (noun)	mensuration (noun)
measuring the intensity of electromagnetic radiation (especially of the sun's rays)	the act or process of assigning numbers to phenomena according to a rule