advocacy group vs NRA

advocacy group and NRA both are nouns.

Word	Noun	Adjective	Verb	Adverb
advocacy group	Yes	No	No	No
NRA	Yes	No	No	No

As nouns, NRA is a hyponym of advocacy group; that is, NRA is a word with a more specific, narrower meaning than advocacy group:

advocacy group: an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying
NRA: a powerful lobby that advocates the right to own and bear arms and rejects any gun regulation by the government

Other hyponyms of advocacy group include National Rifle Association.

advocacy group (noun)	NRA (noun)
an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying	a powerful lobby that advocates the right to own and bear arms and rejects any gun regulation by the government