foster mother vs paramedic

foster mother

noun
  • A female adult who cares for a child who has been placed in foster care. 

paramedic

noun
  • An individual who is licensed at the state or national level to practice medical interventions in an emergency pre-hospital setting. 

  • An individual trained to medically stabilize people through various interventions, victims of trauma or medical events outside of a hospital setting and preparing them for transport to a medical facility. 

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