eruptive vs geology

eruptive is not a noun while geology is a noun.

Word	Noun	Adjective	Verb	Adverb
eruptive	No	Yes	No	No
geology	Yes	No	No	No

eruptive (noun)	geology (noun)
	a science that deals with the history of the earth as recorded in rocks

eruptive (adjective)	geology (adjective)
produced by the action of fire or intense heat
producing or characterized by eruptions
actively spewing out lava