decree vs fiat

decree and fiat both are nouns.

Word	Noun	Adjective	Verb	Adverb
decree	Yes	No	Yes	No
fiat	Yes	No	No	No

As nouns, decree and fiat are synonyms defined as:

decree and fiat: a legally binding command or decision entered on the court record (as if issued by a court or judge)

Other synonyms of decree include edict, order, rescript.

decree (noun)	fiat (noun)
a legally binding command or decision entered on the court record (as if issued by a court or judge)	a legally binding command or decision entered on the court record (as if issued by a court or judge)

decree (verb)	fiat (verb)
decide with authority
issue a decree