ecclesiastical calendar vs church calendar

ecclesiastical calendar and church calendar both are nouns.

Word	Noun	Adjective	Verb	Adverb
ecclesiastical calendar	Yes	No	No	No
church calendar	Yes	No	No	No

As nouns, ecclesiastical calendar and church calendar are synonyms defined as:

ecclesiastical calendar and church calendar: a calendar of the Christian year indicating the dates of fasts and festivals

ecclesiastical calendar (noun)	church calendar (noun)
a calendar of the Christian year indicating the dates of fasts and festivals	a calendar of the Christian year indicating the dates of fasts and festivals