teller vs canvasser

teller and canvasser both are nouns.

Word	Noun	Adjective	Verb	Adverb
teller	Yes	No	No	No
canvasser	Yes	No	No	No

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

teller: an official appointed to count the votes (especially in legislative assembly)
canvasser: a person who takes or counts votes

teller (noun)	canvasser (noun)
an employee of a bank who receives and pays out money	someone who conducts surveys of public opinion
an official appointed to count the votes (especially in legislative assembly)	someone who examines votes at an election
someone who tells a story	a petitioner who solicits contributions or trade or votes
	a person who takes or counts votes