quat vs underperson

quat

adj
  • Quaternary. 

  • Free; no longer involved with; quit. 

verb
  • To relinquish, forsake, give up. 

  • To squat or crouch down. 

noun
  • A quaternary ammonium cation or compound. 

underperson

noun
  • A member of a subhuman sentient species. 

  • A person of low status. 

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