canvasser vs vote counter

canvasser and vote counter both are nouns.

Word	Noun	Adjective	Verb	Adverb
canvasser	Yes	No	No	No
vote counter	Yes	No	No	No

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

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

Other hypernyms of canvasser include teller.

canvasser (noun)	vote counter (noun)
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
a petitioner who solicits contributions or trade or votes
a person who takes or counts votes