measurement vs mensuration

measurement and mensuration both are nouns.

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

As nouns, measurement and mensuration are synonyms defined as:

measurement and mensuration: the act or process of assigning numbers to phenomena according to a rule

Other synonyms of measurement include measure, measuring.

measurement (noun)	mensuration (noun)
the act or process of assigning numbers to phenomena according to a rule	the act or process of assigning numbers to phenomena according to a rule