"Ardri" is a word that has many synonyms, which can be used interchangeably according to the context. The word means "high king," and it is commonly associated with the ancient Irish kingdoms where the person who held the title was considered the most powerful ruler. Some of the possible synonyms for "ardri" include "overlord," "sovereign," "monarch," "tyrant," "emperor," and "potentate." These words evoke a sense of absolute power, authority, and control, and thus can be used to describe a range of figures, including political leaders, military commanders, and rulers of all sorts. Ultimately, the choice of synonym depends on the specific context and individual preferences of the speaker or writer.