certified vs registered

certified and registered both are adjectives.

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

certified (adjective)	registered (adjective)
endorsed authoritatively as having met certain requirements	listed or recorded officially
fit to be certified as insane (and treated accordingly)	(of animals) officially recorded with or certified by a recognized breed association; especially in a stud book
holding appropriate documentation and officially on record as qualified to perform a specified function or practice a specified skill	(of a boat or vessel) furnished with necessary official documents specifying ownership etc