W.W. Phelps calls Joseph's translation instrument "Nephite Interpreters."
William W. Phelps, "Letter No. 4," in Latter Day Saints’ Messenger and Advocate 1, no. 5 (February 1835): 65
The first one is where you sat day after day and wrote the history of the second race that inhabited this continent, as the words were repeated to you by the Lord’s prophet, through the aid of the “Urim and Thumim,” “Nephite Interpreters,” or Divine Spectacles.