Mount Whitney vs Whitney

Mount Whitney and Whitney both are nouns.

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

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

Mount Whitney and Whitney: the highest peak in the Sierra Nevada range in California (14,494 feet high)

Mount Whitney (noun)	Whitney (noun)
the highest peak in the Sierra Nevada range in California (14,494 feet high)	the highest peak in the Sierra Nevada range in California (14,494 feet high)
	United States inventor of the mechanical cotton gin (1765-1825)