canvasser vs pollster

canvasser and pollster both are nouns.

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

As nouns, canvasser and pollster are synonyms defined as:

Other synonyms of canvasser include headcounter, poll taker.

canvasser (noun)	pollster (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