Gulf Coast of the United States vs Fla.

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

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

Gulf Coast of the United States (noun)	Fla. (noun)
a region of the United States comprising states bordering the Gulf of Mexico; Alabama and Florida and Louisiana and Mississippi and Texas	a state in southeastern United States between the Atlantic and the Gulf of Mexico; one of the Confederate states during the American Civil War