Cambrian vs Walian

Cambrian

adj

  • Of or relating to Wales. 

  • Of a geologic period within the Paleozoic era; comprises lower, middle and Furongian epochs from about 542 to 490 million years ago. 

name

  • The Cambrian period. 

noun

  • Synonym of Walian: a Welsh person, a Welshman or Welshwoman. 

Walian

adj

  • Synonym of Welsh: of or relating to Wales. 

noun

  • A Welsh person. 

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