teratology vs embryology

teratology and embryology both are nouns.

Word	Noun	Adjective	Verb	Adverb
teratology	Yes	No	No	No
embryology	Yes	No	No	No

As nouns, embryology is a hypernym of teratology; that is, embryology is a word with a broader meaning than teratology:

teratology: the branch of biology concerned with the development of malformations or serious deviations from the normal type of organism
embryology: the branch of biology that studies the formation and early development of living organisms

teratology (noun)	embryology (noun)
the branch of biology concerned with the development of malformations or serious deviations from the normal type of organism	the branch of biology that studies the formation and early development of living organisms