OPEC vs Organization of Petroleum-Exporting Countries

OPEC and Organization of Petroleum-Exporting Countries both are nouns.

Word	Noun	Adjective	Verb	Adverb
OPEC	Yes	No	No	No
Organization of Petroleum-Exporting Countries	Yes	No	No	No

As nouns, OPEC and Organization of Petroleum-Exporting Countries are synonyms defined as:

OPEC and Organization of Petroleum-Exporting Countries: an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum

OPEC (noun)	Organization of Petroleum-Exporting Countries (noun)
an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum	an organization of countries formed in 1961 to agree on a common policy for the production and sale of petroleum