lunch vs potlatch

lunch

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

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

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

verb
  • To treat to lunch. 

  • To eat lunch. 

potlatch

noun
  • A communal meal to which guests bring dishes to share; a potluck. 

  • A ceremony amongst certain indigenous peoples of the Pacific Northwest in which gifts are bestowed upon guests and personal property is destroyed in a show of generosity and wealth. 

verb
  • To carry out or take part in a potlatch ceremony. 

  • To give; especially, to give as a gift during a potlatch ceremony. 

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