metropole vs motherland

metropole

noun
  • The parent-state of a colony. 

  • A metropolis; the main city of a country or area. 

motherland

noun
  • Mother country in contrast to its colonies. 

  • The country of one's birth. 

  • Country of origin. 

  • The country of one's ancestors. 

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