disloyalty vs treachery

disloyalty and treachery both are nouns.

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

As nouns, treachery is a hyponym of disloyalty; that is, treachery is a word with a more specific, narrower meaning than disloyalty:

Other hyponyms of disloyalty include disaffection, subversiveness, traitorousness, treason, perfidiousness, perfidy.

disloyalty (noun)	treachery (noun)
the quality of being disloyal	an act of deliberate betrayal
	betrayal of a trust