plenum vs meeting

plenum and meeting both are nouns.

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

As nouns, meeting is a hypernym of plenum; that is, meeting is a word with a broader meaning than plenum:

Other hypernyms of plenum include group meeting.

plenum (noun)	meeting (noun)
an enclosed space in which the air pressure is higher than outside	the social act of assembling for some common purpose
a meeting of a legislative body at which all members are present	the act of joining together as one
	a casual or unexpected convergence
	a formally arranged gathering
	a small informal social gathering
	a place where things merge or flow together (especially rivers)