evening vs sundown

evening

noun
  • The time of the day between dusk and night, when it gets dark. 

  • A concluding time period; a point in time near the end of something; the beginning of the end of something. 

  • A party or gathering held in the evening. 

  • The time of the day between the approximate time of midwinter dusk and midnight (compare afternoon); the period after the end of regular office working hours. 

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. 

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