contumacious vs contumacy

contumacious is not a noun while contumacy is a noun.

Word	Noun	Adjective	Verb	Adverb
contumacious	No	Yes	No	No
contumacy	Yes	No	No	No

contumacious (noun)	contumacy (noun)
	willful refusal to appear before a court or comply with a court order; can result in a finding of contempt of court
	obstinate rebelliousness and insubordination; resistance to authority

contumacious (adjective)	contumacy (adjective)
wilfully obstinate; stubbornly disobedient