river basin vs geographic area

river basin and geographic area both are nouns.

Word	Noun	Adjective	Verb	Adverb
river basin	Yes	No	No	No
geographic area	Yes	No	No	No

As nouns, geographic area is a hypernym of river basin; that is, geographic area is a word with a broader meaning than river basin:

river basin: the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet
geographic area: a demarcated area of the Earth

Other hypernyms of river basin include geographic region, geographical area, geographical region.

river basin (noun)	geographic area (noun)
the entire geographical area drained by a river and its tributaries; an area characterized by all runoff being conveyed to the same outlet	a demarcated area of the Earth