betrayer vs traitor

betrayer and traitor both are nouns.

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

As nouns, betrayer and traitor are synonyms defined as:

Other synonyms of betrayer include double-crosser, double-dealer, two-timer.

betrayer (noun)	traitor (noun)
a person who says one thing and does another	someone who betrays his country by committing treason
one who reveals confidential information to the police or other authority	a person who says one thing and does another