SpaceX's Super Heavy is the reusable first stage rocket of the Starship stack. Use only for questions specific to the booster itself. Use with [spacex-starship] when asking about the fully stacked rocket (as the company considers the full stack to be Starship)
Super Heavy is the booster rocket for the main Starship spacecraft. As with its cousin, falcon-9, this part is designed to return to the Earth and land.
From the SpaceX Starship webpage, the full stack is considered to be Starship
SpaceX’s Starship spacecraft and Super Heavy rocket – collectively referred to as Starship – represent a fully reusable transportation system designed to carry both crew and cargo to Earth orbit, the Moon, Mars and beyond. Starship will be the world’s most powerful launch vehicle ever developed, capable of carrying up to 150 metric tonnes fully reusable and 250 metric tonnes expendable.