skid row vs slum area

skid row and slum area both are nouns.

Word	Noun	Adjective	Verb	Adverb
skid row	Yes	No	No	No
slum area	Yes	No	No	No

As nouns, slum area is a hypernym of skid row; that is, slum area is a word with a broader meaning than skid row:

skid row: a city district frequented by vagrants and alcoholics and addicts
slum area: a district of a city marked by poverty and inferior living conditions

Other hypernyms of skid row include slum.

skid row (noun)	slum area (noun)
a city district frequented by vagrants and alcoholics and addicts	a district of a city marked by poverty and inferior living conditions