Opinion poll and Secret ballot

Opinion poll noun - An inquiry into public opinion conducted by interviewing a random sample of people.

Secret ballot and opinion poll are semantically related. In some cases you can use "Secret ballot" instead a noun phrase "Opinion poll".

Secret ballot noun - A vote in which each person's choice is secret but the totaled votes are public.

Opinion poll and secret ballot are semantically related. Sometimes you can use "Opinion poll" instead a noun phrase "Secret ballot".