congregant vs church member

congregant and church member both are nouns.

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

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

congregant: a member of a congregation (especially that of a church or synagogue)
church member: a religious person who goes to church regularly

Other hypernyms of congregant include churchgoer.

congregant (noun)	church member (noun)
a member of a congregation (especially that of a church or synagogue)	a religious person who goes to church regularly