foetometry vs mensuration

foetometry and mensuration both are nouns.

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

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

foetometry: measurement of a fetus (especially the diameter of the head)
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of foetometry include measure, measurement, measuring.

foetometry (noun)	mensuration (noun)
measurement of a fetus (especially the diameter of the head)	the act or process of assigning numbers to phenomena according to a rule