There are several synonyms for the term "big daddy," which refers to a powerful or influential man who commands respect and authority. One of the most common synonyms is "boss," which implies someone who controls a particular domain or organization. Another similar term is "patriarch," which suggests a figurehead who is respected for his wisdom, experience, and leadership. "Kingpin" is another word that can be used to describe a big daddy, particularly in the context of organized crime or illegal enterprises. Other synonyms include "tycoon," "mogul," "captain," and "chief," all of which convey a powerful, authoritative presence.