postulant vs sannyasi

postulant

noun
  • A person seeking admission to a religious order. 

  • A person who submits a petition for something; a petitioner. 

sannyasi

noun
  • A man in the stage of sannyasa; a wandering ascetic, a religious mendicant. 

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