involve vs potlatch

involve

verb
  • To take in; to gather in; to mingle, blend or merge. 

  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

  • To envelop, enfold, entangle. 

potlatch

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

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

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. 

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