newspaper advertisement vs ad

newspaper advertisement and ad both are nouns.

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

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

newspaper advertisement: a printed advertisement that is published in a newspaper
ad: a public promotion of some product or service

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

newspaper advertisement (noun)	ad (noun)
a printed advertisement that is published in a newspaper	a public promotion of some product or service