Jesus answered her, "If you knew the gift of God, and who it is who says to you, 'Give me a drink,' you would have asked him, and he would have given you living water."
The word Christ is a Greek word. It is the translation into Greek of the Hebrew word Messiah. And so, you have the Greek word Christ, but it is a word that is the translation of the word Messiah. So John points that out here. "I know that when the Messiah comes," which in Greek is called Christ, Christos.