classified vs want ad

classified and want ad both are nouns.

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

As nouns, want ad is a hyponym of classified; that is, want ad is a word with a more specific, narrower meaning than classified:

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

classified (noun)	want 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 newspaper advertisement stating what is wanted

classified (adjective)	want ad (adjective)
arranged into classes
official classification of information or documents; withheld from general circulation