Wicca- Was Founded in the 1940 's and 50's by Gerald Gardner, who also wrote a multitude of books on the subject.
Witchcraft-Was founded in the 1600's starting in Scotland then coming to the colonies .
Gothic-Gothic is the term originally used to describe things pertaining to the Gothic people and then reused in a variety of contexts.
The Goths were traditionally thought to have originated in northern Europe and moved south towards the borders of the Roman Empire in the second century. Eventually they occupied territories in modern Germany, Spain and Italy.
The Goths became a byword for northern barbarism and from the sixteenth century their name was given to the dominant architectural and artistic style of the late medieval period, which had originated in France in the twelfth century, Gothic architecture.
The style became idealized in the late eighteenth and early nineteenth centuries within Romanticism, leading to the architectural Gothic revival, beginning in Britain but spreading to continental Europe and North America, by which medieval buildings were restored and large numbers of civil, ecclesiastical and educational buildings built in a medieval style.
The creation of literary works that employed such late medieval backdrops to explore dark aspects of human nature and the supernatural led to the creation of Gothic fiction, which was the origin of the modern horror genre in books, film, T.V. and more recently video game
You can not say that witchcraft and wicca are the same because they aren't , Gothic is not a style it is a time period.
Wicca is a neo-pagan religion that was started by Gerald Gardner and others to become famous granted some of these have written a lot of very informative books but still you must make up your own mind as to what you are or what you do.
