The word "Father of the Submarine" is commonly used to refer to John Philip Holland, the inventor of the first successful submarine. However, there are a few synonyms for this term that are also used in historical accounts and discussions. These include "Submarine Pioneer," "Submarine Innovator," and "Submarine Creator." Each of these terms acknowledges Holland's groundbreaking work in the development of submarines and his foundational contributions to the field. Other related terms might include "Submarine Visionary," "Submarine Trailblazer," or even simply "Submarine Inventor," each of which broadly captures Holland's role in the history of submarine technology.