dishonesty vs perfidy

dishonesty and perfidy both are nouns.

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

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

Other hyponyms of dishonesty include betrayal, treachery, treason, charlatanism, quackery, trick, falsehood, falsification.

dishonesty (noun)	perfidy (noun)
lack of honesty; acts of lying or cheating or stealing	an act of deliberate betrayal
the quality of being dishonest	betrayal of a trust