Little Horn vs Little Bighorn River

Little Horn and Little Bighorn River both are nouns.

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

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

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

Other synonyms of Little Horn include Little Bighorn.

Little Horn (noun)	Little Bighorn River (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