certain vs sealed

certain and sealed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
certain	No	Yes	No	No
sealed	No	Yes	No	No

As adjectives, certain and sealed are synonyms defined as:

certain (adjective)	sealed (adjective)
established beyond doubt or question; definitely known	closed or secured with or as if with a seal
having or feeling no doubt or uncertainty; confident and assured	established irrevocably
certain to occur; destined or inevitable	undisclosed for the time being
established irrevocably	determined irrevocably
exercising or taking care great enough to bring assurance	apply a non-porous coating to something so as to ensure it is impervious
definite but not specified or identified	covered with a waterproof coating
reliable in operation or effect	(of walls) covered with a coat of plaster