perfidy vs treason

perfidy and treason both are nouns.

Word	Noun	Adjective	Verb	Adverb
perfidy	Yes	No	No	No
treason	Yes	No	No	No

As nouns, perfidy and treason are synonyms defined as:

Other synonyms of perfidy include betrayal, treachery.

perfidy (noun)	treason (noun)
an act of deliberate betrayal	a crime that undermines the offender's government
betrayal of a trust	an act of deliberate betrayal
	disloyalty by virtue of subversive behavior