We don't have synonyms for volscan yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are volcan and volscian.
°A vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface.
°A vent or fissure on the surface of a planet (usually in a mountainous form) with a magma chamber attached to the mantle of a planet or moon, periodically erupting forth lava and volcanic gases onto the surface.