dodo vs troglodyte

dodo

noun
  • A person or organisation which is very old or has very old-fashioned views or is not willing to change and adapt. 

  • Fried plantain. 

  • A large, flightless bird, †Raphus cucullatus, related to the pigeon, that is now extinct (since the 1600s) and was native to Mauritius. 

troglodyte

noun
  • A reclusive, reactionary or out-of-date person, especially if brutish. 

  • A person who chooses not to keep up-to-date with the latest software and hardware. 

  • Anything that lives underground. 

  • The Eurasian wren, Troglodytes troglodytes. 

  • A member of a supposed prehistoric race that lived in caves or holes, a caveman. 

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