chela vs pursuivant

chela

noun
  • A pincer-like claw of a crustacean or arachnid. 

  • A pupil or disciple, especially in Hinduism. 

pursuivant

noun
  • A functionary of lower rank than a herald, but discharging similar duties; called also pursuivant at arms; an attendant of the heralds, e.g. in the College of Arms. 

  • A warrant officer. 

  • A royal messenger, (particularly) one with the authority to execute warrants. 

  • A Grand Lodge Officer who guards the inner door during a meeting of the Grand Lodge 

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