Trent vs River Trent

Trent and River Trent both are nouns.

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

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

Trent and River Trent: a river in central England that flows generally northeastward to join with the Ouse River and form the Humber

Other synonyms of Trent include Trent River.

Trent (noun)	River Trent (noun)
a city in northern Italy (northwest of Venice) on the River Adige; the site of the Council of Trent	a river in central England that flows generally northeastward to join with the Ouse River and form the Humber
a river in central England that flows generally northeastward to join with the Ouse River and form the Humber