directive vs dictum

directive and dictum both are nouns.

Word	Noun	Adjective	Verb	Adverb
directive	Yes	Yes	No	No
dictum	Yes	No	No	No

As nouns, dictum is a hypernym of directive; that is, dictum is a word with a broader meaning than directive:

Other hypernyms of directive include pronouncement, say-so.

directive (noun)	dictum (noun)
a pronouncement encouraging or banning some activity	an authoritative declaration
	an opinion voiced by a judge on a point of law not directly bearing on the case in question and therefore not binding

directive (adjective)	dictum (adjective)
showing the way by conducting or leading; imposing direction on