intrusive vs geology

intrusive is not a noun while geology is a noun.

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

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

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