power breakfast vs breakfast

power breakfast and breakfast both are nouns.

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

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

power breakfast: a meeting of influential people to conduct business while eating breakfast
breakfast: the first meal of the day (usually in the morning)

Other hypernyms of power breakfast include get together, meeting.

power breakfast (noun)	breakfast (noun)
a meeting of influential people to conduct business while eating breakfast	the first meal of the day (usually in the morning)

power breakfast (verb)	breakfast (verb)
	eat an early morning meal
	provide breakfast for