programma vs fiat

programma and fiat both are nouns.

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

As nouns, fiat is a hypernym of programma; that is, fiat is a word with a broader meaning than programma:

programma: an edict that has been publicly posted
fiat: a legally binding command or decision entered on the court record (as if issued by a court or judge)

Other hypernyms of programma include decree, edict, order, rescript.

programma (noun)	fiat (noun)
an edict that has been publicly posted	a legally binding command or decision entered on the court record (as if issued by a court or judge)