debatable vs arguable

debatable and arguable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
debatable	No	Yes	No	No
arguable	No	Yes	No	No

As adjectives, debatable and arguable are synonyms defined as:

Other synonyms of debatable include disputable, moot.

debatable (adjective)	arguable (adjective)
capable of being disproved	open to argument or debate
open to argument or debate	capable of being supported by argument
open to doubt or debate