midwifery vs fetology

midwifery and fetology both are nouns.

Word	Noun	Adjective	Verb	Adverb
midwifery	Yes	No	No	No
fetology	Yes	No	No	No

As nouns, fetology is a hyponym of midwifery; that is, fetology is a word with a more specific, narrower meaning than midwifery:

midwifery: the branch of medicine dealing with childbirth and care of the mother
fetology: the branch of medicine concerned with the fetus in the uterus

Other hyponyms of midwifery include foetology, perinatology.

midwifery (noun)	fetology (noun)
assisting women at childbirth	the branch of medicine concerned with the fetus in the uterus
the branch of medicine dealing with childbirth and care of the mother