semidesert vs geographic region

semidesert and geographic region both are nouns.

Word	Noun	Adjective	Verb	Adverb
semidesert	Yes	No	No	No
geographic region	Yes	No	No	No

As nouns, geographic region is a hypernym of semidesert; that is, geographic region is a word with a broader meaning than semidesert:

semidesert: a region much like a desert but usually located between a desert and the surrounding regions
geographic region: a demarcated area of the Earth

Other hypernyms of semidesert include geographic area, geographical area, geographical region.

semidesert (noun)	geographic region (noun)
a region much like a desert but usually located between a desert and the surrounding regions	a demarcated area of the Earth