superior court vs tribunal

superior court and tribunal both are nouns.

Word	Noun	Adjective	Verb	Adverb
superior court	Yes	No	No	No
tribunal	Yes	No	No	No

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

superior court: any court that has jurisdiction above an inferior court
tribunal: an assembly (including one or more judges) to conduct judicial business

Other hypernyms of superior court include court, judicature.

superior court (noun)	tribunal (noun)
any court that has jurisdiction above an inferior court	an assembly (including one or more judges) to conduct judicial business