Euphrates River vs Euphrates

Euphrates River and Euphrates both are nouns.

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

As nouns, Euphrates River and Euphrates are synonyms defined as:

Euphrates River and Euphrates: a river in southwestern Asia; flows into the Persian Gulf; was important in the development of several great civilizations in ancient Mesopotamia

Euphrates River (noun)	Euphrates (noun)
a river in southwestern Asia; flows into the Persian Gulf; was important in the development of several great civilizations in ancient Mesopotamia	a river in southwestern Asia; flows into the Persian Gulf; was important in the development of several great civilizations in ancient Mesopotamia