asker vs questioner

asker and questioner both are nouns.

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

As nouns, asker and questioner are synonyms defined as:

Other synonyms of asker include enquirer, inquirer, querier.

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