IPA: /ˈkænˌvæsər/
KK: /ˈkænˌvæsər/
A person who asks people for their opinions or votes, especially during elections.
The canvasser knocked on doors to gather support for the candidate.
Canvasser → It is formed from 'canvass' (from Middle French *canvasser*, meaning to examine or discuss) and '-er' (meaning a person who). A canvasser is a person who examines or discusses opinions, often by soliciting votes or opinions from others.
Think of someone who is 'examining' or 'discussing' opinions — that's what a canvasser does, as they are the person who engages with others to gather views.