betrayal vs treachery

betrayal and treachery both are nouns.

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

As nouns, betrayal and treachery are synonyms defined as:

Other synonyms of betrayal include perfidy, treason.

betrayal (noun)	treachery (noun)
an act of deliberate betrayal	an act of deliberate betrayal
the quality of aiding an enemy	betrayal of a trust