mephitis vs odor

mephitis

noun
  • A poisonous or foul-smelling gas, especially as emitted from the earth; an unpleasant smell. 

  • A dilution of fluids derived from skunks or polecats. 

odor

noun
  • Any smell, whether fragrant or offensive. 

  • A strong, pervasive quality. 

  • Esteem. 

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