church vs religious service

church and religious service both are nouns.

Word	Noun	Adjective	Verb	Adverb
church	Yes	No	Yes	No
religious service	Yes	No	No	No

As nouns, religious service is a hypernym of church; that is, religious service is a word with a broader meaning than church:

Other hypernyms of church include divine service, service.

church (noun)	religious service (noun)
a service conducted in a house of worship	the act of public worship following prescribed rules
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 (verb)	religious service (verb)
perform a special church rite or service for