classified ad vs newspaper ad

classified ad and newspaper ad both are nouns.

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

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

classified ad: a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type
newspaper ad: a printed advertisement that is published in a newspaper

Other hypernyms of classified ad include newspaper advertisement.

classified ad (noun)	newspaper ad (noun)
a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type	a printed advertisement that is published in a newspaper