day vs noontime

day

noun
  • A 24-hour period beginning at 6am or sunrise. 

  • Rotational period of a planet (especially Earth). 

  • Any period of 24 hours. 

  • The part of a day period which one spends at one’s job, school, etc. 

  • A period from midnight to the following midnight. 

  • A period of contention of a day or less. 

  • A specified time or period; time, considered with reference to the existence or prominence of a person or thing; age; time. 

  • Part of a day period between sunrise and sunset where one enjoys daylight; daytime. 

verb
  • To spend a day (in a place). 

noontime

noun
  • Approximately noon. 

  • Noon. 

  • 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). 

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