Locular is a term used in botany to describe the chamber of an ovary that contains the ovules. It is a specific term that may not have many synonyms in the botanical world. However, some related words that may be used as synonyms for locular include compartment, cavity, chamber, and cell. These words all describe a space that is enclosed by a barrier or membrane of some kind. When used in the context of a plant's ovary, these words may describe the structure of the ovary and its compartments, which is important in understanding the plant's reproductive cycle.