While "witch" itself is an older word with origins in Old English, "wicca" is specifically used in modern times to refer to a contemporary Pagan religion, often called Wiccan.
It's important to note that "witch" and "wicca" are not interchangeable, and "wicca" isn't necessarily the root word of "witchcraft". "Witchcraft" is a broader term that encompasses a wide range of magical practices and beliefs, while "wicca" refers to a specific religion.