gingiva vs jujube

gingiva

noun
  • The gum, consisting of the tissue surrounding the roots of the teeth and covering the jawbone. 

jujube

noun
  • The fruit of this tree. 

  • A type of candy; specific type varies by country. 

  • A fruit-bearing tree, Ziziphus mauritiana. 

  • The fruit of this tree, fructus jujubae. 

  • The sweet and edible drupes (fruits) of several Mediterranean and African species of small trees. 

  • A fruit-bearing tree, Ziziphus jujuba or Ziziphus zizyphus. 

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