canvass vs canvasser

canvass and canvasser both are nouns.

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

canvass (noun)	canvasser (noun)
a heavy, closely woven fabric	someone who conducts surveys of public opinion
the mat that forms the floor of the ring in which boxers or professional wrestlers compete	someone who examines votes at an election
a tent made of canvas fabric	a petitioner who solicits contributions or trade or votes
a large piece of fabric (usually canvas fabric) by means of which wind is used to propel a sailing vessel	a person who takes or counts votes
an oil painting on canvas fabric
an inquiry into public opinion conducted by interviewing a random sample of people
the setting for a narrative or fictional or dramatic account

canvass (verb)	canvasser (verb)
consider in detail and subject to an analysis in order to discover essential features or meaning
solicit votes from potential voters in an electoral campaign
get the opinions (of people) by asking specific questions