foetology vs obstetrics

foetology and obstetrics both are nouns.

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

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

foetology: 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 foetology include midwifery, OB, tocology.

foetology (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