comforter vs teething ring

comforter and teething ring both are nouns.

Word	Noun	Adjective	Verb	Adverb
comforter	Yes	No	No	No
teething ring	Yes	No	No	No

As nouns, comforter and teething ring are synonyms defined as:

comforter and teething ring: device used for an infant to suck or bite on

Other synonyms of comforter include baby's dummy, pacifier.

comforter (noun)	teething ring (noun)
bedding made of two layers of cloth filled with stuffing and stitched together	device used for an infant to suck or bite on
device used for an infant to suck or bite on
a person who commiserates with someone who has had misfortune
a person who reduces the intensity (e.g., of fears) and calms and pacifies