clastic vs geology

clastic is not a noun while geology is a noun.

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

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

clastic (adjective)	geology (adjective)
capable of being taken apart
of or belonging to or being a rock composed of fragments of older rocks (e.g., conglomerates or sandstone)