comforter vs teething ring

comforter

noun
  • A pacifier. 

  • A person who comforts someone who is suffering. 

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

teething ring

noun
  • An object designed for a baby or toddler to chew during the teething stage 

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