West Coast of the United States vs West Coast

West Coast of the United States and West Coast both are nouns.

Word	Noun	Adjective	Verb	Adverb
West Coast of the United States	Yes	No	No	No
West Coast	Yes	No	No	No

As nouns, West Coast of the United States and West Coast are synonyms defined as:

West Coast of the United States and West Coast: the western seaboard of the United States from Washington to southern California

West Coast of the United States (noun)	West Coast (noun)
the western seaboard of the United States from Washington to southern California	the western seaboard of the United States from Washington to southern California