'Prophet' in the Bible

All Israel from Dan even to Beersheba knew that Samuel was confirmed as a prophet of the Lord.

(Formerly in Israel, when a man went to inquire of God, he used to say, “Come, and let us go to the seer”; for he who is called a prophet now was formerly called a seer.)

The prophet Gad said to David, “Do not stay in the stronghold; depart, and go into the land of Judah.” So David departed and went into the forest of Hereth.