drainage basin vs drainage area

drainage basin and drainage area both are nouns.

Word	Noun	Adjective	Verb	Adverb
drainage basin	Yes	No	No	No
drainage area	Yes	No	No	No

As nouns, drainage basin and drainage area are synonyms defined as:

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

Other synonyms of drainage basin include basin, catchment area, catchment basin, river basin, watershed.

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