traitor vs double-dealer

traitor and double-dealer both are nouns.

Word	Noun	Adjective	Verb	Adverb
traitor	Yes	No	No	No
double-dealer	Yes	No	No	No

As nouns, traitor and double-dealer are synonyms defined as:

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

traitor (noun)	double-dealer (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