ask vs asker

ask is not a noun while asker is a noun.

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

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

ask (verb)	asker (verb)
make a request or demand for something to somebody
direct or put; seek an answer to
address a question to and expect an answer from
consider obligatory; request and expect
require or ask for as a price or condition
make a date
require as useful, just, or proper