Boyd’s Bible Dictionary:
(wizard). One who pretends to deal with evil spirits in order to work a spell on persons or their belongings; conjurer, fortune-teller, exorcist, supernatural curer of diseases (Deut. 18:10; 1 Sam. 28:3-25). The word formerly embraced both sexes, but is now applied to women. Witches were not allowed to live (Ex. 22:18).
Concise Bible Dictionary:
The word kashaph is “to use magical formulas or incantations,” “to practice sorcery.” A witch was not suffered to live (Ex. 22:18; Deut. 18:10; 2 Kings 9:22; 2 Chron. 33:6; Mic. 5:12; Nah. 3:4). In 1 Samuel 15:23 the word is qesem, divination. In Galatians 5:20 it is φαρμακεία, sorcery. See DIVINATION.