pelvimetry vs mensuration

pelvimetry and mensuration both are nouns.

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

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

pelvimetry: measurement of the dimensions of the bony birth canal (to determine whether vaginal birth is possible)
mensuration: the act or process of assigning numbers to phenomena according to a rule

Other hypernyms of pelvimetry include measure, measurement, measuring.

pelvimetry (noun)	mensuration (noun)
measurement of the dimensions of the bony birth canal (to determine whether vaginal birth is possible)	the act or process of assigning numbers to phenomena according to a rule