Great lady is a phrase often used to describe a woman of high status or importance. However, there are many synonyms that can be used to describe such a woman. A few examples include "dame", "matron", "matriarch", "noblewoman", "dignitary", and "grand dame". Each of these words carry a certain level of prestige and sophistication that are associated with the term "great lady". Additionally, other terms like "queen", "princess", and "empress" could also be considered synonyms for great lady, as they connote royalty, power, and privilege. Ultimately, the specific synonym used would depend on the context and the specific qualities being emphasized about the woman in question.