Mobile vs Mobile River

Mobile and Mobile River both are nouns.

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

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

Mobile and Mobile River: a river in southwestern Alabama; flows into Mobile Bay

Mobile (noun)	Mobile River (noun)
a port in southwestern Alabama on Mobile Bay	a river in southwestern Alabama; flows into Mobile Bay
a river in southwestern Alabama; flows into Mobile Bay