surveying vs mensuration

surveying and mensuration both are nouns.

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

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

surveying: the practice of measuring angles and distances on the ground so that they can be accurately plotted on a map
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of surveying include measure, measurement, measuring.

surveying (noun)	mensuration (noun)
the practice of measuring angles and distances on the ground so that they can be accurately plotted on a map	the act or process of assigning numbers to phenomena according to a rule