A castle tower can be referred to using a variety of synonyms that depict its distinct structural features or its relevance to the castle defensive system. Additionally, its descriptive elements such as its height, shape, and location contribute to unique synonyms that can be used interchangeably with castle tower. These synonyms include turrets, keep, donjon, bastion, fort, citadel, bulwark, stronghold, rampart, and battlement. Whether it is a round keep, foreboding donjon, or rectangular bastion, each of these synonyms delivers a unique meaning that brings to mind the imposing and defensive character of a castle tower.