Irrawaddy vs Irrawaddy River

Irrawaddy and Irrawaddy River both are nouns.

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

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

Irrawaddy and Irrawaddy River: the main river of Myanmar rising in the north and flowing south through the length of Burma to empty into the Andaman Sea

Irrawaddy (noun)	Irrawaddy River (noun)
the main river of Myanmar rising in the north and flowing south through the length of Burma to empty into the Andaman Sea	the main river of Myanmar rising in the north and flowing south through the length of Burma to empty into the Andaman Sea