As nouns the difference between asker and questioner
is that asker is alternative form of nodot=9 lang=en ("an eft or newt") while questioner is a person who asks questions, or who conducts an official enquiry.
asker
English
Etymology 1
From (etyl) aske, arske, from (etyl) .
Etymology 2
Noun
(
en noun)
The person who asks a question
questioner
English
Noun
(
en noun)
A person who asks questions, or who conducts an official enquiry
Synonyms
*inquirer
*inquisitor
*interrogator