churchgoer vs church member

churchgoer and church member both are nouns.

Word	Noun	Adjective	Verb	Adverb
churchgoer	Yes	No	No	No
church member	Yes	No	No	No

As nouns, churchgoer and church member are synonyms defined as:

churchgoer and church member: a religious person who goes to church regularly

churchgoer (noun)	church member (noun)
a religious person who goes to church regularly	a religious person who goes to church regularly