privateer
noun [ C ] uk/ˌpraɪ.vəˈtɪər/ us/ˌpraɪ.vəˈtɪr/
（尤指在17、18世纪，战时获得特许，攻击敌方商船等的）武装民船、私掠船
a person or ship allowed by a government to attack and steal from ships at sea, especially in the 17th and 18th centuries
Compare: buccaneerpirate