headcounter vs inquirer

headcounter and inquirer both are nouns.

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

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

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

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