river vs Euphrates River

river and Euphrates River both are nouns.

Word	Noun	Adjective	Verb	Adverb
river	Yes	No	No	No
Euphrates River	Yes	No	No	No

river (noun)	Euphrates River (noun)
a large natural stream of water (larger than a creek)	a river in southwestern Asia; flows into the Persian Gulf; was important in the development of several great civilizations in ancient Mesopotamia