rule out vs decree

rule out is not a noun while decree is a noun.

Word	Noun	Adjective	Verb	Adverb
rule out	No	No	Yes	No
decree	Yes	No	Yes	No

As verbs, decree is a hypernym of rule out; that is, decree is a word with a broader meaning than rule out:

rule out: include or exclude by determining judicially or in agreement with rules
decree: decide with authority

Other hypernyms of rule out include rule.

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

rule out (verb)	decree (verb)
dismiss from consideration or a contest	decide with authority
include or exclude by determining judicially or in agreement with rules	issue a decree
make impossible, especially beforehand