grump vs rheum

grump

noun
  • A grumpy mood. 

  • A habitually grumpy or complaining person. 

verb
  • To complain. 

  • To be grumpy. 

rheum

noun
  • Tears. 

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

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

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