When discussing the medieval concept of "liege-lord," there are several other synonyms that can be used to convey the same idea. One common term is "sovereign," which refers to a ruler who has ultimate authority over a particular realm or territory. "Master" or "lord" are less formal synonyms that can also be used to describe the relationship between a feudal lord and their vassal. Alternatively, "liegeman" or "vassal" specifically refer to the person who owes loyalty and service to their liege-lord. These synonyms all capture different aspects of the medieval feudal system and can be used interchangeably depending on the context in which they are being used.