offering vs perquisite

offering

noun
  • That which has been offered; a sacrifice. 

  • Something put forth, bid, proffered or tendered, such as for sale 

  • The act by which something is offered. 

  • A contribution given at a religious service. 

  • An oblation or presentation made as a religious act. 

perquisite

noun
  • A gratuity. 

  • Any monetary or other incidental benefit beyond salary. 

  • A privilege or possession held or claimed exclusively by a certain person, group or class. 

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