advertising campaign vs ad campaign

advertising campaign and ad campaign both are nouns.

Word	Noun	Adjective	Verb	Adverb
advertising campaign	Yes	No	No	No
ad campaign	Yes	No	No	No

As nouns, advertising campaign and ad campaign are synonyms defined as:

advertising campaign and ad campaign: an organized program of advertisements

Other synonyms of advertising campaign include ad blitz.

advertising campaign (noun)	ad campaign (noun)
an organized program of advertisements	an organized program of advertisements