pacifier vs teether

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. 

teether

noun
  • A device given to infants to help soothe inflamed gums during teething, often filled with a fluid or gel that can be frozen or refrigerated. 

  • One who teethes. 

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