fetology vs obstetrics

fetology and obstetrics both are nouns.

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

As nouns, obstetrics is a hypernym of fetology; that is, obstetrics is a word with a broader meaning than fetology:

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

Other hypernyms of fetology include midwifery, OB, tocology.

fetology (noun)	obstetrics (noun)
the branch of medicine concerned with the fetus in the uterus	the branch of medicine dealing with childbirth and care of the mother