Marquisate is a term used to describe an area of land or a territory governed by a marquis. Although it is not a very common term, there are several synonyms that can be used to describe the same concept. One such synonym is "march," which refers to a borderland or a region located at the edge of a country. Another synonym for marquisate is "marchland," which also refers to a remote border region. Similarly, "marcher lordship" can also be used to describe a territory governed by a marquis. Other possible synonyms for marquisate include earldom, barony, and principality, depending on the specific context in which the term is used.