newspaper ad vs newspaper advertisement

newspaper ad and newspaper advertisement both are nouns.

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

As nouns, newspaper ad and newspaper advertisement are synonyms defined as:

newspaper ad and newspaper advertisement: a printed advertisement that is published in a newspaper

newspaper ad (noun)	newspaper advertisement (noun)
a printed advertisement that is published in a newspaper	a printed advertisement that is published in a newspaper