fetometry vs foetometry

fetometry and foetometry both are nouns.

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

As nouns, fetometry and foetometry are synonyms defined as:

fetometry and foetometry: measurement of a fetus (especially the diameter of the head)

fetometry (noun)	foetometry (noun)
measurement of a fetus (especially the diameter of the head)	measurement of a fetus (especially the diameter of the head)