Vocabulary What does 海賊 (かいぞく, kaizoku) mean? 海賊 (かいぞく, kaizoku) means pirate. Quick factsReadingかいぞくRomajikaizokuPart of speechnoun 海賊かいぞくkaizokupirate1noun pirateKanji in this word海sea賊bandit, thief; traitor