geology vs intrusive

geology is a noun but intrusive is not a noun.

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

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

geology (adjective)	intrusive (adjective)
	tending to intrude (especially upon privacy)
	thrusting inward
	of rock material; forced while molten into cracks between layers of other rock