Confess
Most of the Old Testaments uses of the word "confess" occurs in the sense of acknowledging who God is (praise), acknowledging what God has done (thanksgiving), and acknowledging sin (confession).
The word "confess" in the New Testament expresses the idea of verbalizing agreement with an idea or someone. Confess is found in the sense of agreeing to do a certain thing (promise), agreeing that Jesus is the Son of God (confess), agreeing with God's greatness (praise), and agreeing about our sinfulness (confess).
A confession requires verbal acknowledgment of verbalizing agreement, it also implies action.