double standard vs ethical code

double standard and ethical code both are nouns.

Word	Noun	Adjective	Verb	Adverb
double standard	Yes	No	No	No
ethical code	Yes	No	No	No

As nouns, ethical code is a hypernym of double standard; that is, ethical code is a word with a broader meaning than double standard:

double standard: an ethical or moral code that applies more strictly to one group than to another
ethical code: a system of principles governing morality and acceptable conduct

Other hypernyms of double standard include ethic.

double standard (noun)	ethical code (noun)
an ethical or moral code that applies more strictly to one group than to another	a system of principles governing morality and acceptable conduct