headcounter vs querier

headcounter and querier both are nouns.

Word	Noun	Adjective	Verb	Adverb
headcounter	Yes	No	No	No
querier	Yes	No	No	No

As nouns, querier is a hypernym of headcounter; that is, querier is a word with a broader meaning than headcounter:

Other hypernyms of headcounter include asker, enquirer, inquirer, questioner.

headcounter (noun)	querier (noun)
someone who conducts surveys of public opinion	someone who asks a question