toll agent vs toller

toll agent and toller both are nouns.

Word	Noun	Adjective	Verb	Adverb
toll agent	Yes	No	No	No
toller	Yes	No	No	No

As nouns, toll agent and toller are synonyms defined as:

Other synonyms of toll agent include toll collector, toll taker, tollgatherer, tollkeeper, tollman.

toll agent (noun)	toller (noun)
someone employed to collect tolls	someone employed to collect tolls
	a person who rings church bells (as for summoning the congregation)