treason vs treachery

treason and treachery both are nouns.

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

As nouns, treason and treachery are synonyms defined as:

Other synonyms of treason include betrayal, perfidy.

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