custom vs procedure

custom

noun
  • Long-established practice, considered as unwritten law, and resting for authority on long consent. Compare prescription. 

  • Frequent repetition of the same behavior; way of behavior common to many; ordinary manner; habitual practice; method of doing, living or behaving. 

  • Habitual buying of goods; practice of frequenting, as a shop, factory, etc., for making purchases or giving orders; business support. 

  • Traditional beliefs or rituals. 

  • A custom (made-to-order) piece of art, pornography, etc. 

adj
  • Created under particular specifications, specially to fit one's needs: specialized, unique, custom-made. 

  • Own, personal, not standard or premade. 

procedure

noun
  • The steps taken in an action or other legal proceeding. 

  • A particular method for performing a task. 

  • A series of small tasks or steps taken to accomplish an end. 

  • A subroutine or function coded to perform a specific task, but does not return a value. 

  • A surgical operation. 

  • The set of established forms or methods of an organized body for accomplishing a certain task or tasks. 

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