certain vs sure

certain and sure both are adjectives.

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

As adjectives, certain and sure are synonyms defined as:

certain and sure: having or feeling no doubt or uncertainty; confident and assured

As adjectives, certain and sure are synonyms defined as:

As adjectives, certain and sure are synonyms defined as:

certain and sure: exercising or taking care great enough to bring assurance

As adjectives, certain and sure are synonyms defined as:

certain (adjective)	sure (adjective)
established beyond doubt or question; definitely known	having or feeling no doubt or uncertainty; confident and assured
having or feeling no doubt or uncertainty; confident and assured	certain to occur; destined or inevitable
certain to occur; destined or inevitable	exercising or taking care great enough to bring assurance
established irrevocably	reliable in operation or effect
exercising or taking care great enough to bring assurance	physically secure or dependable
definite but not specified or identified	certain not to fail
reliable in operation or effect	infallible or unfailing
	(of persons) worthy of trust or confidence
	impossible to doubt or dispute

certain (adverb)	sure (adverb)
	definitely or positively (`sure' is sometimes used informally for `surely')