interrogator vs inquirer

interrogator and inquirer both are nouns.

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

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

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

interrogator (noun)	inquirer (noun)
a questioner who is excessively harsh	someone who asks a question