ringer vs toller

ringer and toller both are nouns.

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

As nouns, ringer and toller are synonyms defined as:

ringer and toller: a person who rings church bells (as for summoning the congregation)

Other synonyms of ringer include bell ringer.

ringer (noun)	toller (noun)
(horseshoes) the successful throw of a horseshoe or quoit so as to encircle a stake or peg	someone employed to collect tolls
a contestant entered in a competition under false pretenses	a person who rings church bells (as for summoning the congregation)
a person who is almost identical to another
a person who rings church bells (as for summoning the congregation)