Little Bighorn River vs Little Horn

Little Bighorn River and Little Horn both are nouns.

Word	Noun	Adjective	Verb	Adverb
Little Bighorn River	Yes	No	No	No
Little Horn	Yes	No	No	No

As nouns, Little Bighorn River and Little Horn are synonyms defined as:

Little Bighorn River and Little Horn: a river that flows from northern Wyoming into the Bighorn River in southern Montana; site of Custer's Last Stand

Other synonyms of Little Bighorn River include Little Bighorn.

Little Bighorn River (noun)	Little Horn (noun)
a river that flows from northern Wyoming into the Bighorn River in southern Montana; site of Custer's Last Stand	a river that flows from northern Wyoming into the Bighorn River in southern Montana; site of Custer's Last Stand