signaler vs toller

signaler and toller both are nouns.

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

As nouns, toller is a hyponym of signaler; that is, toller is a word with a more specific, narrower meaning than signaler:

Other hyponyms of signaler include signalman, bell ringer, ringer, whistler.

signaler (noun)	toller (noun)
someone who communicates by signals	someone employed to collect tolls
	a person who rings church bells (as for summoning the congregation)