want ad vs classified ad

want ad and classified ad both are nouns.

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

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

want ad: a newspaper advertisement stating what is wanted
classified ad: a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type

Other hypernyms of want ad include classified, classified advertisement.

want ad (noun)	classified ad (noun)
a newspaper advertisement stating what is wanted	a short ad in a newspaper or magazine (usually in small print) and appearing along with other ads of the same type