church vs Christian

church and Christian both are nouns.

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

church (noun)	Christian (noun)
a service conducted in a house of worship	a religious person who believes Jesus is the Christ and who is a member of a Christian denomination
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

church (adjective)	Christian (adjective)
	relating to or characteristic of Christianity

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