dawn vs onfall

dawn

noun
  • The rising of the sun. 

  • The earliest phase of something. 

  • The morning twilight period immediately before sunrise. 

  • The time when the sun rises. 

verb
  • To begin to give promise; to begin to appear or to expand. 

  • To begin to brighten with daylight. 

  • To start to appear or be realized. 

onfall

noun
  • The fall of the evening. 

  • A fall of rain or snow. 

  • A falling on or upon; an attack, onset, or assault. 

verb
  • To fall on or upon. 

  • To assault, attack. 

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