powerhouse vs power grid

powerhouse and power grid both are nouns.

Word	Noun	Adjective	Verb	Adverb
powerhouse	Yes	No	No	No
power grid	Yes	No	No	No

powerhouse (noun)	power grid (noun)
an electrical generating station	a system of high tension cables by which electrical power is distributed throughout a region
a team considered to be the best of its class
a highly energetic and indefatigable person