decree vs overrule

decree is a noun but overrule is not a noun.

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

As verbs, overrule is a hyponym of decree; that is, overrule is a word with a more specific, narrower meaning than decree:

Other hyponyms of decree include override, overthrow, overturn, reverse, rule in, rule out.

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

decree (verb)	overrule (verb)
decide with authority	rule against
issue a decree