Due to different naming customs and design-capabilities, some vessels bore the designation of 'battlecruiser' while serving as frigate-analogs on a galactic scale, like the Kaloth-style battlecruiser and the Hapes-built Nova-class battle cruiser.
Informally, the term 'battlecruiser' had been used for centuries to refer to any massive, heavily armored battleship designed for the single purpose of destroying other capital ships.
2.8 Praetor Mark II-class battlecruiser.