convenience vs heartbeat

convenience

noun
  • A convenient time. 

  • Any object that makes life more convenient; a helpful item. 

  • The quality of being convenient. 

verb
  • To make convenient 

heartbeat

noun
  • A very short space of time; an instant. 

  • A periodic signal generated by hardware or software to indicate normal operation or to synchronize other parts of a system. 

  • One pulsation of the heart; especially an irregular one, hence the emotion which causes it. 

  • A driving impulse or vital force; the vital center of something. 

  • The rhythm at which a heart pulsates, a cardiac indicator. 

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