Wicca is an eclectic set of beliefs and traditions, that are of modern possibility thanks to gerald gardener. Almost any of the modern authors on wicca have him to thank, he gave offshots to alexandrian wicca, and from them came buckland and others. The wiccans utilize witchcraft.
Witchcraft can also be of traditions that predate gardenarianism, and hold no alliagance to the term Wicca, as well. Certain family traditions have survived and are as such not Wiccan unless a practitioner takes that term for simplicity.
Wicca also comes from the term Wicce, or wise woman. Pagan derives from Pagani, or "people of the field", a term commonlygiven to non catholics as catholicism spread to denote and also lead into the term Heathen. Warlock means "traitor". There is of course, much much much more.
Note:im 30- i was taught the family traditions of "the old ways" around age 8. My great grandmother was removed from Scotland in the 20's, for practicing. In many parts of he world, family traditions or those that predate Gardener and his practices actively dnounce the term Wicca, or witchcraft. Obvious reasoning would point to why. They only survived by secrecy. In my teenage years, i had to study the modern Wiccan movement, its roots, and the differences between it and our familys history as Cameron's in Scotland and our Old Ways. Its actually quite profound, but we do practice witchcraft, a very oldkind of which Raymond Buckland wrote a book about, but was completely wrong about Scottish Witchcraft. We are far from a solitary tradition. Its generational.
An important note about Wicca is Gerald Gardener claims he wastaught by an aunt who never was proven to exsisted, and the Alexandrian tradition that seperated itselffrom his ways did so due to other family trads, and more so over gardener having a sexual fascination with self mutilation, and being a literal massochist.