MIDI vs musical instrument digital interface

MIDI and musical instrument digital interface both are nouns.

Word	Noun	Adjective	Verb	Adverb
MIDI	Yes	No	No	No
musical instrument digital interface	Yes	No	No	No

As nouns, MIDI and musical instrument digital interface are synonyms defined as:

MIDI and musical instrument digital interface: a standard protocol for communication between electronic musical instruments and computers

MIDI (noun)	musical instrument digital interface (noun)
a standard protocol for communication between electronic musical instruments and computers	a standard protocol for communication between electronic musical instruments and computers