ecclesiastical vs church

ecclesiastical is not a noun while church is a noun.

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

ecclesiastical (noun)	church (noun)
	a service conducted in a house of worship
	a place for public (especially Christian) worship
	one of the groups of Christians who have their own beliefs and forms of worship
	the body of people who attend or belong to a particular local church

ecclesiastical (adjective)	church (adjective)
of or associated with a church (especially a Christian Church)

ecclesiastical (verb)	church (verb)
	perform a special church rite or service for