pressure group vs advocacy group

pressure group and advocacy group both are nouns.

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

As nouns, pressure group and advocacy group are synonyms defined as:

pressure group and advocacy group: an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying

pressure group (noun)	advocacy group (noun)
an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying	an interest group that tries to influence legislators or bureaucrats to act in their favor, typically through lobbying