ad campaign vs ad blitz

ad campaign and ad blitz both are nouns.

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

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

Other synonyms of ad campaign include advertising campaign.

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