Mount Shasta vs Shasta

Mount Shasta and Shasta both are nouns.

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

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

Mount Shasta and Shasta: a volcanic mountain peak in the Cascade Range in northern California (14,162 feet high)

Mount Shasta (noun)	Shasta (noun)
a volcanic mountain peak in the Cascade Range in northern California (14,162 feet high)	the Shastan language spoken by the Shasta
	a volcanic mountain peak in the Cascade Range in northern California (14,162 feet high)
	a member of the Indian people of northern California and southern Oregon