biology vs systematic

biology is a noun but systematic is not a noun.

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

biology (noun)	systematic (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)	systematic (adjective)
	characterized by order and planning
	of or relating to taxonomy