The phrase 'lord days' typically refers to the days in which someone holds a particularly elevated position or title, such as a lord or lady. Some synonyms for this phrase might include 'ruling days,' 'dominant days,' 'sovereign days,' 'reigning days,' or 'supreme days.' These alternatives all convey a sense of power and control, emphasizing the authority that comes with holding a high position of influence. Similarly, you might also use terms like 'noble days,' 'aristocratic days,' or 'patrician days' to emphasize the status and privilege that comes with being in a position of power.