shantytown vs slum area

shantytown and slum area both are nouns.

Word	Noun	Adjective	Verb	Adverb
shantytown	Yes	No	No	No
slum area	Yes	No	No	No

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

shantytown: a city district inhabited by people living in huts and shanties
slum area: a district of a city marked by poverty and inferior living conditions

Other hypernyms of shantytown include slum.

shantytown (noun)	slum area (noun)
a city district inhabited by people living in huts and shanties	a district of a city marked by poverty and inferior living conditions