newspaper ad vs advertising

newspaper ad and advertising both are nouns.

Word	Noun	Adjective	Verb	Adverb
newspaper ad	Yes	No	No	No
advertising	Yes	No	No	No

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

Other hypernyms of newspaper ad include ad, advert, advertisement, advertizement, advertizing.

newspaper ad (noun)	advertising (noun)
a printed advertisement that is published in a newspaper	the business of drawing public attention to goods and services
	a public promotion of some product or service