betray vs betrayer

betray is not a noun while betrayer is a noun.

Word	Noun	Adjective	Verb	Adverb
betray	No	No	Yes	No
betrayer	Yes	No	No	No

betray (noun)	betrayer (noun)
	a person who says one thing and does another
	one who reveals confidential information to the police or other authority

betray (verb)	betrayer (verb)
give away information about somebody
reveal unintentionally
cause someone to believe an untruth
disappoint, prove undependable to; abandon, forsake
deliver to an enemy by treachery
be sexually unfaithful to one's partner in marriage