certified vs certifiable

certified and certifiable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
certified	No	Yes	No	No
certifiable	No	Yes	No	No

As adjectives, certified and certifiable are synonyms defined as:

certified and certifiable: fit to be certified as insane (and treated accordingly)

certified (adjective)	certifiable (adjective)
endorsed authoritatively as having met certain requirements	capable of being guaranteed or certified
fit to be certified as insane (and treated accordingly)	fit to be certified as insane (and treated accordingly)
holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill