cello vs double bass

cello

noun
  • A large unfretted stringed instrument of the violin family with four strings tuned (lowest to highest) C-G-D-A and an endpin to support its weight, usually played with a bow. 

  • cellophane 

double bass

noun
  • The largest stringed instrument of the violin family. 

  • The deepest of all male voices. 

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