catchment basin vs drainage area

catchment basin and drainage area both are nouns.

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

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

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

catchment 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