river vs Tunguska

river and Tunguska both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Tunguska	Yes	No	No	No

river (noun)	Tunguska (noun)
a large natural stream of water (larger than a creek)	a river in southeastern Siberia that flows northwest from Lake Baikal to become a tributary of the Yenisei River
	a river that arises to the north of Lake Baikal and flows north and west to the Yenisei River
	a river in Siberia that flows northwest to become a tributary of the Yenisei River