Gulf Coast of the United States vs TX

Gulf Coast of the United States and TX both are nouns.

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

Gulf Coast of the United States (noun)	TX (noun)
a region of the United States comprising states bordering the Gulf of Mexico; Alabama and Florida and Louisiana and Mississippi and Texas	the second largest state; located in southwestern United States on the Gulf of Mexico