Is Witch? (or ... What Is a Witch?)
Taken from the Introduction of
Witchraft: Exploring the World of Wicca
by Craig S. Hawkins
It is difficult to define with precision the beliefs and practices of contemporary witches. This is because of the elasticity of the terms witch and witchcraft as they have been applied to people and practices both today and throughout history. It is also because of the great diversity that exists within the contemporary movement. Moreover, witches disagree among themselves as to what constitutes a witch. 
In an article titled "Witchcraft: An Inside
View," J. Gordon Melton mentions four ways in which the one word
witchcraft has been applied: 
Perhaps a contemporary example from two different cultic groups will help to illustrate the point. If a Jehovah's Witness believes what the Watchtower Bible and Tract Society teaches, he or she is not a Christian and is not saved, since that group denies all of the essential teachings of historic orthodox Christianity.  Likewise with a Mormon who subscribes to what the Church of Jesus Christ of Latter-Day Saints says.  Nonetheless, the Jehovah's Witness does not believe what the Mormon does or vice versa. Thus, though both belief systems are false, we should not confuse the two. The same is true with witchcraft and Satanism and/or other occultic systems.
One of the most common definitions for what constitutes a witch is anyone who is involved in some form of the occult (e.g., palm readers, tarot card readers, ritual magicians/sorcerers, Satanists, voodoo practitioners -- everything from alchemists to necromancers and astral projection to visualization). One reason for this is because the most common English translations of the Bible (e.g., King James Version, Revised Standard Version, New International Version, New American Standard Bible) have used the English words witch and witchcraft to translate Hebrew and Greek words that designated various types of occultists and occultic practices, such as divination, magic/sorcery, and spiritism. In keeping with the meaning of the original biblical languages and in light of the changing definitions of these words through history, I will reserve the terms witch and witchcraft here. This statement should in no sense be seen as an endorsement of other types of occultism, which are clearly condemned in God's Word (see chapter 5).
It is not merely believing in or practicing magic or divination that makes a person a witch. That is a far too inclusive definition that would cover every paganistic practitioner and occultist in creation. Witchcraft constitutes a given segment of the occult but not the whole spectrum.
Some authors have offered elaborate classification systems to more accurately define witchcraft.  This has the advantage not only of distinguishing the way the word witch has historically been applied but also of distinguishing contemporary types of witchcraft from these other types of witchcraft, or so-called witchcraft, and among the various types of witchcraft within the contemporary movement today. Isaac Bonewits, a neopagan, has probably developed the most detailed scheme in this regard.  He lists the following: Classic, Shamans, Gothic, Familial (also known as Family Traditions or Fam-Trads), Immigrant, Neopagan, Feminist, Neoclassical, Neogothic, Neoshammanic, Ethnic, and Anthropological witches.
Before I give my definitions of witchcraft and witch please keep in mind the following quote from Margot Adler: "Since the Craft is decentralized and each coven is autonomous, no single definition applies to all Wiccans [witches]."  For the sake of accuracy, consistency, and clarity, I will limit the terms witchcraft and witch to the following definitions:
To use Isaac Bonewits's terminology, these definitions include only Neopagan, some Neoshammanic, Feminist, and some Familial witchcraft. I will not apply the term witch to occultists such as mediums, psychics, Satanists, etc. Nor will I use witchcraft for other occultic practices, although they are nonetheless anathematized in the Bible.