The vessel known as the Executor was classified as a Star Dreadnought.
A type of dreadnought was the Star Dreadnought. The Subjugator-class heavy cruiser utilized by the Confederacy of Independent Systems was among the ships designated as Star Dreadnoughts, alongside some Imperial Super Star Destroyers like the Executor-class Star Dreadnought and the Assertor-class Star Dreadnought. Additionally, First Order capital ships such as the Mega-class Star Dreadnought and the specialized Mandator IV-class Siege Dreadnought were also included.
The Galactic Empire's naval forces made use of the Star Dreadnought class known as the Assertor-class Star Dreadnought.
During its reign, the Galactic Empire also employed the Executor-class Star Dreadnought. This class included two variations: the Executor I-class and the Executor II-class Star Dreadnoughts.
A specific Star Dreadnought class, referred to as a Siege Dreadnought, was the Mandator IV-class Siege Dreadnought, which the First Order put into service. It was engineered to besiege a planet or a fleet. The Fulminatrix, which participated in the Battle of D'Qar, serves as an illustration.
Another Star Dreadnought class that the First Order utilized was the Mega-class Star Dreadnought. The Supremacy, the class's sole ship, functioned as the First Order's mobile headquarters and the flagship of Supreme Leader Snoke.
The Confederacy of Independent Systems employed the heavy cruiser class known as the Subjugator-class heavy cruiser, which was produced by Free Dac Volunteers Engineering Corps. It was also recognized as a Star Dreadnought class. The Malevolence, which served as the initial testbed for the Subjugator-class, also received the Star Dreadnought designation.
The Executor, an Executor-class Star Dreadnought that served as Darth Vader's flagship and the flagship of his personal armada, Death Squadron, made its debut in the 1980 film Star Wars: Episode V The Empire Strikes Back. However, the class remained unidentified until 2002, when the Legends book Star Wars: Attack of the Clones Incredible Cross-Sections was released years after the release of The Empire Strikes Back. After the 2014 canon reboot, it appeared in the reference book Ultimate Star Wars in 2015. During the Battle of Endor in the 1983 film Star Wars: Episode VI Return of the Jedi, Admiral Gial Ackbar was the first to refer to the Executor-class Star Dreadnought as a Super Star Destroyer.