meeting vs conventicle

meeting and conventicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
meeting	Yes	No	No	No
conventicle	Yes	No	No	No

As nouns, conventicle is a hyponym of meeting; that is, conventicle is a word with a more specific, narrower meaning than meeting:

meeting (noun)	conventicle (noun)
the social act of assembling for some common purpose	a building for religious assembly (especially Nonconformists, e.g., Quakers)
the act of joining together as one	a secret unauthorized meeting for religious worship
a casual or unexpected convergence
a formally arranged gathering
a small informal social gathering
a place where things merge or flow together (especially rivers)