According to the Oxford Dictionary, volcano is " a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are or have been erupted from the earth's crust".
According to the Etymology Dictionary, the word volcano comes from the name of the Roman god of fire, Vulcan. " The origin of the Roman god of fire Vulcan has been traced back to the Cretan god Velchanos by Gérard Capdeville, primarily under the suggestion of the close similarity of their names" in words of wikipedia Encyclopedia.
Other words referring to volcano are volcanogenic, volcanological, volcanology. We can see the use of the word volcano in this article.