pollster vs inquirer

pollster and inquirer both are nouns.

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

As nouns, inquirer is a hypernym of pollster; that is, inquirer is a word with a broader meaning than pollster:

Other hypernyms of pollster include asker, enquirer, querier, questioner.

pollster (noun)	inquirer (noun)
someone who conducts surveys of public opinion	someone who asks a question