dust bowl vs geographic region

dust bowl and geographic region both are nouns.

Word	Noun	Adjective	Verb	Adverb
dust bowl	Yes	No	No	No
geographic region	Yes	No	No	No

As nouns, geographic region is a hypernym of dust bowl; that is, geographic region 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
geographic region: a demarcated area of the Earth

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

dust bowl (noun)	geographic region (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