credo vs formulary

credo

noun
  • A statement of a belief or a summary statement of a whole belief system; also (metonymically) the belief or belief system itself. 

  • The liturgical creed (usually the Nicene Creed), or a musical arrangement of it for use in church services. 

formulary

noun
  • A list of formulas; a collection of set forms to be followed, especially in religious belief. 

  • A pharmacopoeia or list of available drugs, particularly prescription drugs 

  • A list of drugs, created by health insurers, hospitals, or prescription drug plans, that defines how costs for any drug are shared between patient and health care provider, typically broken down by tiers such as preferred generics with lowest copay, or preferred brand with higher copay, or non-preferred brand and not covered tiers with the highest cost to the patient. 

  • An ancient or medieval collection of models for official writings. 

  • A collection of formulas in sciences and mathematics. 

adj
  • Stated; prescribed; ritual. 

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