For certain and One-hundred percent

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

One-hundred percent and for certain are semantically related. In some cases you can use "One-hundred percent" instead an adverb phrase "For certain".

For certain and one-hundred percent are semantically related. Sometimes you can use "For certain" instead an adverb phrase "One-hundred percent".