daytime vs noontime

daytime

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

adj
  • Happening during the day. 

  • Pertaining to daytime; appropriate to the day. 

noontime

noun
  • The time at which something peaks in some way (e.g., in vitality, in influence, in reknown) (by analogy with the waxing of the sun each day). 

  • Approximately noon. 

  • Noon. 

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