The term 'Prosperous Time' can be summarized by two crossword solutions, 'BOOM' and 'HEYDAY'. 'BOOM' is a term used to describe a period of rapid economic growth and development, usually accompanied by a rise in population and an increase in wealth. 'HEYDAY' is a term used to describe a period of great success or popularity, often associated with a peak in a person's or organization's power or influence. Together, these two words describe a time of great prosperity and success.