traitor vs betrayer

traitor and betrayer both are nouns.

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

As nouns, traitor and betrayer are synonyms defined as:

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

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