tocology vs fetology

tocology and fetology both are nouns.

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

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

tocology: 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 tocology include foetology, perinatology.

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