onfall vs origin

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. 

origin

noun
  • The beginning of something. 

  • The proximal end of attachment of a muscle to a bone that will not be moved by the action of that muscle. 

  • An arbitrary point on Earth's surface, chosen as the zero for a system of coordinates. 

  • The source of a river, information, goods, etc. 

  • Ancestry. 

  • The point at which the axes of a coordinate system intersect. 

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