biology vs neurobiology

biology and neurobiology both are nouns.

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

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

biology: the science that studies living organisms
neurobiology: the branch of biology that deals with the anatomy and physiology and pathology of the nervous system

biology (noun)	neurobiology (noun)
the science that studies living organisms	the branch of biology that deals with the anatomy and physiology and pathology of the nervous system
all the plant and animal life of a particular region
characteristic life processes and phenomena of living organisms