common cold vs rheum

common cold

noun
  • A very common, mild viral infection of the nose and throat, whose symptoms include sneezing, sniffling, a running or blocked nose, a sore throat, coughing and a headache. 

rheum

noun
  • Watery or thin discharge of serum or mucus, especially from the eyes or nose, formerly thought to cause disease. 

  • Tears. 

  • Illness or disease thought to be caused by such secretions; a catarrh, a cold; rheumatism. 

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