ad campaign vs advertising campaign

ad campaign and advertising campaign both are nouns.

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

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

ad campaign and advertising campaign: an organized program of advertisements

Other synonyms of ad campaign include ad blitz.

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