“A seer is one who sees with spiritual eyes. He perceives the meaning of that which seems obscure to [unclear to or hidden from] others; therefore he is an interpreter and clarifier of eternal truth. He foresees the future from the past and the present. This he does by the power of the Lord operating through him directly, or indirectly with the aid of divine instruments such as the Urim and Thummim. In short, he is one who sees, who walks in the Lord’s light with open eyes” (John A. Widtsoe, Evidences and Reconciliations, arr. G. Homer Durham, 3 vols. in 1 [1960], 258).
PROPHET
A prophet is “a person who has been called by and speaks for God. As a messenger of God, a prophet receives commandments, prophecies, and revelations from God. His responsibility is to make known God’s will and true character to mankind and to show the meaning of his dealings with them. A prophet denounces sin and foretells its consequences. He is a preacher of righteousness. On occasion, prophets may be inspired to foretell the future for the benefit of mankind. His primary responsibility, however, is to bear witness of Christ” (Guide to the Scriptures, “Prophet,” scriptures.lds.org).