pollster vs canvasser

pollster and canvasser both are nouns.

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

As nouns, pollster and canvasser are synonyms defined as:

Other synonyms of pollster include headcounter, poll taker.

pollster (noun)	canvasser (noun)
someone who conducts surveys of public opinion	someone who conducts surveys of public opinion
	someone who examines votes at an election
	a petitioner who solicits contributions or trade or votes
	a person who takes or counts votes