"Benjamin Day" is a proper noun that refers to the founder of the first successful penny press newspaper, The New York Sun. Although there are no direct synonyms for this specific name, it is worth noting that its usage can be interchangeable with phrases like "founder of The New York Sun" or "pioneer of the penny press". These alternatives accurately convey the same meaning as "Benjamin Day" but provide a broader context and understanding of the individual's historical significance. By using these synonyms, one can effectively communicate the importance of Benjamin Day's contribution to the newspaper industry during the 19th century.