ad campaign vs crusade

ad campaign and crusade both are nouns.

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

As nouns, crusade is a hypernym of ad campaign; that is, crusade is a word with a broader meaning than ad campaign:

ad campaign: an organized program of advertisements
crusade: a series of actions advancing a principle or tending toward a particular end

Other hypernyms of ad campaign include campaign, cause, drive, effort, movement.

ad campaign (noun)	crusade (noun)
an organized program of advertisements	a series of actions advancing a principle or tending toward a particular end

ad campaign (verb)	crusade (verb)
	go on a crusade; fight a holy war
	exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for