For certain and Sure-enough

For certain adverb - Definitely or positively (`sure' is sometimes used informally for `surely').

Sure-enough and for certain are semantically related in definite topic. In some cases you can use "Sure-enough" instead an adjective phrase "For certain".

Sure-enough adjective - Being exactly as appears or as claimed.

For certain and sure-enough are semantically related in definite topic. Sometimes you can use "For certain" instead the phrase "Sure-enough" as an adjective or an adverb.