medieval mode vs church mode

medieval mode and church mode both are nouns.

Word	Noun	Adjective	Verb	Adverb
medieval mode	Yes	No	No	No
church mode	Yes	No	No	No

As nouns, medieval mode and church mode are synonyms defined as:

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

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

medieval mode (noun)	church 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