ecclesiastical mode vs Gregorian mode

ecclesiastical mode and Gregorian mode both are nouns.

Word	Noun	Adjective	Verb	Adverb
ecclesiastical mode	Yes	No	No	No
Gregorian mode	Yes	No	No	No

As nouns, ecclesiastical mode and Gregorian mode are synonyms defined as:

ecclesiastical mode and Gregorian mode: any of a system of modes used in Gregorian chants up until 1600; derived historically from the Greek mode

Other synonyms of ecclesiastical mode include church mode, medieval mode.

ecclesiastical mode (noun)	Gregorian mode (noun)
any of a system of modes used in Gregorian chants up until 1600; derived historically from the Greek mode	any of a system of modes used in Gregorian chants up until 1600; derived historically from the Greek mode