dust bowl vs geographical area

dust bowl and geographical area both are nouns.

Word	Noun	Adjective	Verb	Adverb
dust bowl	Yes	No	No	No
geographical area	Yes	No	No	No

As nouns, geographical area is a hypernym of dust bowl; that is, geographical area is a word with a broader meaning than dust bowl:

dust bowl: a region subject to dust storms; especially the central region of United States subject to dust storms in the 1930s
geographical area: a demarcated area of the Earth

Other hypernyms of dust bowl include geographic area, geographic region, geographical region.

dust bowl (noun)	geographical area (noun)
a region subject to dust storms; especially the central region of United States subject to dust storms in the 1930s	a demarcated area of the Earth