Song vs Warring States

Song

name
  • The era of Chinese history during which the dynasty reigned. 

  • A former dynasty in China, reigning from the end of the Five Dynasties and Ten Kingdoms to the beginning of the Yuan. 

  • A surname from Khmer. 

  • A former empire in China, occupying the eastern half of modern China. 

  • A surname from Chinese. 

  • A local government area of Adamawa State, Nigeria. 

  • A river in Papua New Guinea 

  • A river in China; any of various minor rivers in China. 

Warring States

name
  • The era in ancient Chinese history following the Spring and Autumn period and concluding with the first imperial unification of China under the Qin dynasty (c. 475 BC to 221 BC). 

  • The era in ancient Japanese history of social upheaval and military conflict known as the Sengoku period that came to an end under the unification of the Tokugawa shogunate (c. 1467 – c. 1603). 

How often have the words Song and Warring States occurred in a corpus of books? (source: Google Ngram Viewer )