inquirer vs questioner

inquirer and questioner both are nouns.

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

As nouns, inquirer and questioner are synonyms defined as:

Other synonyms of inquirer include asker, enquirer, querier.

inquirer (noun)	questioner (noun)
someone who asks a question	someone who asks a question