Synonyms for the term "Gideon Welles" are limited, as it refers to a specific historical figure. Gideon Welles was an influential American politician who served as the Secretary of the Navy during the Civil War. His actions profoundly impacted the Union Navy's development, strengthening it for the conflict. Synonyms for his name would include references to his role as Secretary of the Navy during this era. However, it's important to note that using synonyms for specific historical figures' names may not accurately convey the intended meaning and historical context. Thus, it is recommended to refer to Gideon Welles by his actual name for accurate representation.