sundown vs sunset

sundown

noun
  • Sunset. 

  • A hat with a wide brim to shade the eyes from sunlight. 

verb
  • to experience an episode or an onset of some detrimental mental condition like agitation, anxiety, hallucination or dementia, daily at nightfall. 

sunset

noun
  • The changes in color of the sky before and after sunset. 

  • The moment each evening when the sun disappears below the western horizon. 

  • A set termination date. 

  • The final period of the life of a person or thing. 

  • The region where the sun sets; the west. 

verb
  • To phase out. 

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