The battle-royale game will supercede its predecessor as the sole CoD mobile title. Microsoft have confirmed that Call of Duty Mobile will be superseded by Warzone Mobile, and be phased out once the latter releases.
The sun doesn't have a scientific name, it is sometimes called Sol. Solis is Latin for sun; Sol is the Roman equivalent of the Greek sun God Helios. The sun does have a symbol, which is a circle with a dot in the center.