congregant vs churchgoer

congregant and churchgoer both are nouns.

Word	Noun	Adjective	Verb	Adverb
congregant	Yes	No	No	No
churchgoer	Yes	No	No	No

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

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

Other hypernyms of congregant include church member.

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