church mode vs medieval mode

church mode and medieval mode both are nouns.

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

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

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

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

church mode (noun)	medieval 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