drainage area vs catchment area

drainage area and catchment area both are nouns.

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

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

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

drainage area (noun)	catchment 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