effort vs ad campaign

effort and ad campaign both are nouns.

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

As nouns, ad campaign is a hyponym of effort; that is, ad campaign is a word with a more specific, narrower meaning than effort:

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

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