St. Francis vs Saint Francis River

St. Francis and Saint Francis River both are nouns.

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

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

St. Francis and Saint Francis River: a tributary of the Mississippi River that rises in Missouri and flows southeastward through Arkansas

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

St. Francis (noun)	Saint Francis River (noun)
a tributary of the Mississippi River that rises in Missouri and flows southeastward through Arkansas	a tributary of the Mississippi River that rises in Missouri and flows southeastward through Arkansas
(Roman Catholic Church) an Italian and the Roman Catholic monk who founded the Franciscan order of friars (1181-1226)