MIDI vs protocol

MIDI and protocol both are nouns.

Word	Noun	Adjective	Verb	Adverb
MIDI	Yes	No	No	No
protocol	Yes	No	No	No

As nouns, protocol is a hypernym of MIDI; that is, protocol is a word with a broader meaning than MIDI:

MIDI: a standard protocol for communication between electronic musical instruments and computers
protocol: (computer science) rules determining the format and transmission of data

Other hypernyms of MIDI include communications protocol.

MIDI (noun)	protocol (noun)
a standard protocol for communication between electronic musical instruments and computers	code of correct conduct
	forms of ceremony and etiquette observed by diplomats and heads of state
	(computer science) rules determining the format and transmission of data