ad blitz vs ad campaign

ad blitz and ad campaign both are nouns.

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

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

Other synonyms of ad blitz include advertising campaign.

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