teether vs teething ring

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. 

teething ring

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

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