As one of the more obscure titles in the royal hierarchy, finding synonyms for "prince regent" may be a little tricky. Essentially, a prince regent is someone who temporarily takes on the duties of a monarch who is incapacitated or too young to rule. However, other terms that could be used to describe a prince regent include "acting monarch", "regent prince", "ruling prince", or simply "regent". In some cases, a prince regent may also be referred to as a "caretaker monarch" or "interim ruler". Regardless of the terminology used, the concept of a prince regent dates back centuries, and has been an important tool for ensuring continuity and stability in various monarchies around the world.