ringer vs ring

ringer and ring both are nouns.

Word	Noun	Adjective	Verb	Adverb
ringer	Yes	No	No	No
ring	Yes	No	Yes	No

ringer (noun)	ring (noun)
(horseshoes) the successful throw of a horseshoe or quoit so as to encircle a stake or peg	jewelry consisting of a circlet of precious metal (often set with jewels) worn on the finger
a contestant entered in a competition under false pretenses	a strip of material attached to the leg of a bird to identify it (as in studies of bird migration)
a person who is almost identical to another	a rigid circular band of metal or wood or other material used for holding or fastening or hanging or pulling
a person who rings church bells (as for summoning the congregation)	a platform usually marked off by ropes in which contestants box or wrestle
	a characteristic sound
	the sound of a bell ringing
	an association of criminals
	(chemistry) a chain of atoms in a molecule that forms a closed loop
	a toroidal shape

ringer (verb)	ring (verb)
	get or try to get into communication (with someone) by telephone
	attach a ring to the foot of, in order to identify
	extend on all sides of simultaneously; encircle
	sound loudly and sonorously
	make (bells) ring, often for the purposes of musical edification
	ring or echo with sound