church vs Christianity

church and Christianity both are nouns.

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

church (noun)	Christianity (noun)
a service conducted in a house of worship	a monotheistic system of beliefs and practices based on the Old Testament and the teachings of Jesus as embodied in the New Testament and emphasizing the role of Jesus as savior
a place for public (especially Christian) worship	the collective body of Christians throughout the world and history (found predominantly in Europe and the Americas and Australia)
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 (verb)	Christianity (verb)
perform a special church rite or service for