Darling vs Darling River

Darling and Darling River both are nouns.

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

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

Darling and Darling River: an Australian river; tributary of the Murray River

Darling (noun)	Darling River (noun)
an Australian river; tributary of the Murray River	an Australian river; tributary of the Murray River