IPA: /ˈpoʊl.stɚ/
KK: /ˈpoʊlstər/
A person or organization that conducts surveys to gather opinions from the public about various topics, often used in politics and marketing.
The pollster reported that most voters support the new policy.
Pollster → The word is derived from 'poll' (from Middle English *pol*, meaning head or top) and the suffix '-ster' (a person who). A pollster is a person who conducts surveys or polls, often to gauge public opinion.
Think of someone who is involved in taking a 'head count' ('poll') — that's why a pollster is a person who conducts surveys.