withdraw vs withdrawer

withdraw is not a noun while withdrawer is a noun.

Word	Noun	Adjective	Verb	Adverb
withdraw	No	No	Yes	No
withdrawer	Yes	No	No	No

withdraw (noun)	withdrawer (noun)
	a depositor who withdraws funds previously deposited
	a student who withdraws from the educational institution in which he or she was enrolled
	a contestant who withdraws from competition
	a drug addict who is discontinuing the use of narcotics
	an individualist who withdraws from social interaction
	an authority who withdraws permission

withdraw (verb)	withdrawer (verb)
keep away from others
remove something concrete, as by lifting, pushing, or taking off, or remove something abstract
make a retreat from an earlier commitment or activity
take back what one has said
release from something that holds fast, connects, or entangles
lose interest
pull back or move away or backward
remove (a commodity) from (a supply source)
cause to be returned
break from a meeting or gathering
withdraw from active participation
retire gracefully