Rainbow vs metis

Rainbow

noun
  • A member of the Rainbow Guides, a Girl Guide movement for younger girls. 

name
  • A census-designated place in San Diego County, California, United States. 

  • A surname. 

metis

noun
  • A person of mixed-race ancestry. 

  • A person of one-eighth black ancestry; an octoroon. 

  • Practical intelligence; street smarts. 

adj
  • Of mixed heritage 

  • Of Métis heritage. 

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