Demibastion, a term used in fortification architecture, refers to a half-bastion shape structure that extends from the main wall and provides additional defensive support. While it is a specific term, there are several synonyms that can be used interchangeably. These synonyms include: demi-lune, half-moon, fleche, and hornwork. Each of these words refers to a similar type of structure that was commonly used in fortifications throughout history. The use of these synonyms can help to broaden the vocabulary used to describe a demibastion, with each word providing a different nuance and meaning for the same type of structure.