Captain Cook was a famous explorer, navigator, and cartographer who is known for his voyages and discoveries in the Pacific Ocean. As such, there are several synonyms that could be used to describe him, including navigator, discoverer, seafarer, explorer, adventurer, and captain. Although the term "Captain Cook" may be the most commonly used, these synonyms provide a more nuanced description of his many achievements and contributions. Additionally, they help to emphasize the wide range of skills and expertise required to undertake such voyages of discovery, from navigation and cartography to diplomacy and leadership.