lifeguard vs rescue

lifeguard

noun
  • A lifesaver. 

  • An attendant, usually an expert swimmer, employed to save swimmers in trouble or near drowning at a body of water. 

  • A sturdy metal bracket fixed in front of each of the leading wheels of a train to deflect small objects away from the wheels to prevent derailment. 

  • A bodyguard or unit of bodyguards, a guard of someone's (especially a king's) life or person. 

rescue

noun
  • An act or episode of rescuing, saving. 

  • A rescuee. 

  • A liberation, freeing. 

  • 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 lifeguard and rescue occurred in a corpus of books? (source: Google Ngram Viewer )