lunch vs mealtime

lunch

noun
  • A light meal usually eaten around midday, notably when not as main meal of the day. 

  • Any small meal, especially one eaten at a social gathering. 

  • A break in play between the first and second sessions. 

verb
  • To treat to lunch. 

  • To eat lunch. 

mealtime

noun
  • The appointed time at which a meal is served or eaten. 

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