canvasser vs teller

canvasser and teller both are nouns.

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

As nouns, teller is a hypernym of canvasser; that is, teller is a word with a broader meaning than canvasser:

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

Other hypernyms of canvasser include vote counter.

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