comforter vs helper

comforter

noun
  • A person who comforts someone who is suffering. 

  • A pacifier. 

  • A padded cover for a bed, duvet, continental quilt. 

helper

noun
  • One who helps; an aide; assistant; auxiliary. 

  • That which helps; anything serving to assist. 

  • A locomotive that assists a train, usually on steep gradients. 

  • A person who does cleaning and cooking in a family home, or in a market; domestic employee. 

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