crepusculum vs daytime

crepusculum

noun
  • crepuscule; twilight; dusk 

daytime

noun
  • The time of daylight; the time between sunrise and sunset. 

adj
  • Happening during the day. 

  • Pertaining to daytime; appropriate to the day. 

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