D&C 21

The called the Prophet Joseph Smith, amongst other things, a prophet saying - 

"Behold, there shall be a record kept among you; and in it thou shalt be called a seer, a translator, a prophet, an apostle of Jesus Christ, an elder of the church through the will of God the Father, and the grace of your Lord Jesus Christ..."  (Doctrine and Covenants 21:1)

Of a prophet, Elder Widtsoe taught - 

“A prophet is a teacher. That is the essential meaning of the word. He teaches the body of truth, the gospel, revealed by the Lord to man; and under inspiration explains it to the understanding of the people. He is an expounder of truth. Moreover, he shows that the way to human happiness is through obedience to God’s law. He calls to repentance those who wander away from the truth. He becomes a warrior for the consummation of the Lord’s purposes with respect to the human family. The purpose of his life is to uphold the Lord’s plan of salvation. All this he does by close communion with the Lord, until he is ‘full of power by the spirit of the Lord.’ (Micah 3:8; see also D&C 20:26; 34:10; 43:16) 

“In the course of time the word ‘prophet’ has come to mean, perhaps chiefly, a man who receives revelations and directions from the Lord. The principal business of a prophet has mistakenly been thought to foretell coming events, to utter prophecies, which is only one of the several prophetic functions.

 “In the sense that a prophet is a man who receives revelations from the Lord, the titles ‘seer and revelator’ merely amplify the larger and inclusive meaning of the title ‘prophet.’” (Evidences and Reconciliations, 1:204–5.)