questioner vs asker

questioner and asker both are nouns.

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

As nouns, questioner and asker are synonyms defined as:

Other synonyms of questioner include enquirer, inquirer, querier.

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