pacifier vs teething ring

pacifier

noun
  • A rubber or plastic device imitating a nipple that goes into a baby’s mouth, used to calm and quiet the baby. 

  • Someone or something that pacifies. 

teething ring

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

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