schedule vs vary

schedule

verb
  • To create a time-schedule. 

  • To add a name to the list of people who are participating in something. 

  • To plan an activity at a specific date or time in the future. 

  • To admit (a person) to hospital as an involuntary patient under a schedule of the applicable mental health law. 

noun
  • A written or printed table of information, often forming an annex or appendix to a statute or other regulatory instrument, or to a legal contract. 

  • A serial record of items, systematically arranged. 

  • One of the five divisions into which controlled drugs are classified, or the restrictions denoted by such classification. 

  • An allocation or ordering of a set of tasks on one or several resources. 

  • A procedural plan, usually but not necessarily tabular in nature, indicating a sequence of operations and the planned times at which those operations are to occur. 

vary

verb
  • To change with time or a similar parameter. 

  • To make of different kinds; to make different from one another; to diversity; to variegate. 

  • To embellish; to change fancifully; to present under new aspects, as of form, key, measure, etc. See variation. 

  • To be or act different from the usual. 

  • Not to remain constant: to change with time or a similar parameter. 

  • To institute a change in, from a current state; to modify. 

  • To display differences. 

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