lifeline vs rescue

lifeline

noun
  • A source of salvation in a crisis. 

  • A particular crease in the palm. 

  • A line from the diver to a tender at the surface control point. 

  • A line to which a drowning or falling victim may cling. 

  • A means or route for transporting indispensable supplies. 

  • System or structure of vital importance to a community. 

  • On the deck of a boat, a line to which one can attach oneself to stay aboard on rough seas. 

rescue

noun
  • A liberation, freeing. 

  • A rescuee. 

  • An act or episode of rescuing, saving. 

  • The forcible ending of a siege; liberation from similar military peril 

  • A special airliner flight to bring home passengers who are stranded 

verb
  • To recover forcibly. 

  • To achieve something positive under difficult conditions. 

  • To free or liberate from confinement or other physical restraint. 

  • To save from any violence, danger or evil. 

  • To deliver by arms, notably from a siege. 

  • To remove or withdraw from a state of exposure to evil and sin. 

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