high court vs judicature

high court and judicature both are nouns.

Word	Noun	Adjective	Verb	Adverb
high court	Yes	No	No	No
judicature	Yes	No	No	No

As nouns, judicature is a hypernym of high court; that is, judicature is a word with a broader meaning than high court:

high court: the highest court in most states of the United States
judicature: an assembly (including one or more judges) to conduct judicial business

Other hypernyms of high court include court, tribunal.

high court (noun)	judicature (noun)
the highest court in most states of the United States	the act of meting out justice according to the law
	the position of judge
	the system of law courts that administer justice and constitute the judicial branch of government
	an assembly (including one or more judges) to conduct judicial business