newspaper ad vs advertizement

newspaper ad and advertizement both are nouns.

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

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

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

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