court of appeals vs tribunal

court of appeals and tribunal both are nouns.

Word	Noun	Adjective	Verb	Adverb
court of appeals	Yes	No	No	No
tribunal	Yes	No	No	No

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

court of appeals: a court whose jurisdiction is to review decisions of lower courts or agencies
tribunal: an assembly (including one or more judges) to conduct judicial business

Other hypernyms of court of appeals include court, judicature.

court of appeals (noun)	tribunal (noun)
a court whose jurisdiction is to review decisions of lower courts or agencies	an assembly (including one or more judges) to conduct judicial business