Great Rift Valley vs geology

Great Rift Valley and geology both are nouns.

Word	Noun	Adjective	Verb	Adverb
Great Rift Valley	Yes	No	No	No
geology	Yes	No	No	No

Great Rift Valley (noun)	geology (noun)
(geology) a depression in southwestern Asia and eastern Africa; extends from the valley of the Jordan River to Mozambique; marked by geological faults	a science that deals with the history of the earth as recorded in rocks