advocacy group vs pressure group

advocacy group and pressure group both are nouns.

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

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

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

advocacy group (noun)	pressure 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