Mount Rushmore vs Rushmore

Mount Rushmore and Rushmore both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mount Rushmore	Yes	No	No	No
Rushmore	Yes	No	No	No

As nouns, Mount Rushmore and Rushmore are synonyms defined as:

Mount Rushmore and Rushmore: a mountain in the Black Hills of South Dakota; the likenesses of Washington and Jefferson and Lincoln and Roosevelt are carved on it

Other synonyms of Mount Rushmore include Mt. Rushmore.

Mount Rushmore (noun)	Rushmore (noun)
a mountain in the Black Hills of South Dakota; the likenesses of Washington and Jefferson and Lincoln and Roosevelt are carved on it	a mountain in the Black Hills of South Dakota; the likenesses of Washington and Jefferson and Lincoln and Roosevelt are carved on it