igneous vs geology

igneous is not a noun while geology is a noun.

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

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

igneous (adjective)	geology (adjective)
produced by the action of fire or intense heat
produced under conditions involving intense heat
like or suggestive of fire