biology vs embryology

biology and embryology both are nouns.

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

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

biology: the science that studies living organisms
embryology: the branch of biology that studies the formation and early development of living organisms

biology (noun)	embryology (noun)
the science that studies living organisms	the branch of biology that studies the formation and early development of living organisms
all the plant and animal life of a particular region
characteristic life processes and phenomena of living organisms