The word "demenses" refers to a person's lands, property, or estate. There are several synonyms for this word that can be used interchangeably. For instance, "domains" is a synonym that refers to an area of territory or a field of activity. "Realms" is another synonym that refers to a kingdom, sphere, or domain of knowledge. Other synonyms for "demenses" include "holdings", "properties", "estates", "fields", "possessions", "territories", and "lands". Each of these words can be used to describe a person's assets or wealth, and they can be used in various contexts such as business, law, and real estate.