drainage basin vs catchment basin

drainage basin and catchment basin both are nouns.

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

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

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

drainage basin (noun)	catchment 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