drainage area vs drainage basin

drainage area and drainage basin both are nouns.

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

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

drainage area and drainage basin: 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 area include basin, catchment area, catchment basin, river basin, watershed.

drainage area (noun)	drainage basin (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