biology vs in vivo

biology is a noun but in vivo is not a noun.

Word	Noun	Adjective	Verb	Adverb
biology	Yes	No	No	No
in vivo	No	Yes	No	Yes

biology (noun)	in vivo (noun)
the science that studies living organisms
all the plant and animal life of a particular region
characteristic life processes and phenomena of living organisms

biology (adjective)	in vivo (adjective)
	of a biological process occurring within a living organism

biology (adverb)	in vivo (adverb)
	in the living organism