ad campaign vs effort

ad campaign and effort both are nouns.

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

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

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

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

ad campaign (noun)	effort (noun)
an organized program of advertisements	earnest and conscientious activity intended to do or accomplish something
	use of physical or mental energy; hard work
	a notable achievement
	a series of actions advancing a principle or tending toward a particular end