Saint Johns vs St. Johns River

Saint Johns and St. Johns River both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Johns	Yes	No	No	No
St. Johns River	Yes	No	No	No

As nouns, Saint Johns and St. Johns River are synonyms defined as:

Saint Johns and St. Johns River: a river in northeastern Florida that flows northward to Jacksonville and then eastward to empty into the Atlantic Ocean

Other synonyms of Saint Johns include Saint Johns River, St. Johns.

Saint Johns (noun)	St. Johns River (noun)
a river in northeastern Florida that flows northward to Jacksonville and then eastward to empty into the Atlantic Ocean	a river in northeastern Florida that flows northward to Jacksonville and then eastward to empty into the Atlantic Ocean