biological science vs apposition

biological science and apposition both are nouns.

Word	Noun	Adjective	Verb	Adverb
biological science	Yes	No	No	No
apposition	Yes	No	No	No

biological science (noun)	apposition (noun)
the science that studies living organisms	the act of positioning close together (or side by side)
	(biology) growth in the thickness of a cell wall by the deposit of successive layers of material
	a grammatical relation between a word and a noun phrase that follows