St. Johns River vs Saint Johns

St. Johns River and Saint Johns both are nouns.

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

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

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

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

St. Johns River (noun)	Saint Johns (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