power breakfast vs meeting

power breakfast and meeting both are nouns.

Word	Noun	Adjective	Verb	Adverb
power breakfast	Yes	No	No	No
meeting	Yes	No	No	No

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

power breakfast: a meeting of influential people to conduct business while eating breakfast
meeting: a small informal social gathering

Other hypernyms of power breakfast include breakfast, get together.

power breakfast (noun)	meeting (noun)
a meeting of influential people to conduct business while eating breakfast	the social act of assembling for some common purpose
	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)