There are several synonyms for the phrase "woman monarch," which refers to a female rule or reign over a kingdom or empire. Some of the common synonyms include queen, empress, tsarina, princess, sultana, and regent. Queen is perhaps the most commonly used synonym for a woman monarch, and it can refer to a ruler's wife or a female sovereign in her own right. Empress is a title given to the wife of an emperor, while tsarina is a female counterpart to the ruler of Russia. Princess is a daughter of a monarch or a female sovereign in her own right, while sultana is the female equivalent of a sultan. Finally, a regent is a woman who governs a country on behalf of a monarch or a prince.