advance payment vs preferment

advance payment

noun
  • The part of a contractually due sum that is paid or received in advance for a good, service or social security payment. 

preferment

noun
  • Prior claim (on payment, or on purchasing something); the first rights to obtain a particular payment or product. 

  • Advancement to a higher position or office; promotion. 

  • A position (especially in the Church of England) that provides profit or prestige. 

  • A mixture of flour, water and yeast that is allowed to ferment prior to another baking process 

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