mountain range vs Black Hills

mountain range and Black Hills both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain range	Yes	No	No	No
Black Hills	Yes	No	No	No

mountain range (noun)	Black Hills (noun)
a series of hills or mountains	mountains in southwestern South Dakota and northeastern Wyoming; sacred to the Sioux (whites settling in the Black Hills led to the Battle of Little Bighorn); site of Mount Rushmore