sellout vs perfidy

sellout and perfidy both are nouns.

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

As nouns, perfidy is a hypernym of sellout; that is, perfidy is a word with a broader meaning than sellout:

Other hypernyms of sellout include betrayal, treachery, treason.

sellout (noun)	perfidy (noun)
a betrayal of one's principles principles, country, cause, etc.	an act of deliberate betrayal
the selling of an entire stock of something	betrayal of a trust
an event for which all tickets are sold
someone who has sold out