imperial decree vs edict

imperial decree and edict both are nouns.

Word	Noun	Adjective	Verb	Adverb
imperial decree	Yes	No	No	No
edict	Yes	No	No	No

As nouns, edict is a hypernym of imperial decree; that is, edict is a word with a broader meaning than imperial decree:

imperial decree: a decree issued by a sovereign ruler
edict: a legally binding command or decision entered on the court record (as if issued by a court or judge)

Other hypernyms of imperial decree include decree, fiat, order, rescript.

imperial decree (noun)	edict (noun)
a decree issued by a sovereign ruler	a legally binding command or decision entered on the court record (as if issued by a court or judge)
	a formal or authoritative proclamation