egg timer vs timekeeper

egg timer

noun
  • An hourglass mouse pointer. 

  • A small version of an hourglass used to time the boiling of an egg. 

  • A timer that can be set to sound an alarm after a certain amount of time; a kitchen timer. 

timekeeper

noun
  • A device that shows the time; a timepiece. 

  • A person (or something controlled by a person) that is or isn't punctual. 

  • A person who keeps records of the hours of attendance of employees. 

  • A person who records the time elapsed in a sporting event. 

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