fireball vs powerhouse

fireball and powerhouse both are nouns.

Word	Noun	Adjective	Verb	Adverb
fireball	Yes	No	No	No
powerhouse	Yes	No	No	No

As nouns, fireball and powerhouse are synonyms defined as:

Other synonyms of fireball include ball of fire, human dynamo.

fireball (noun)	powerhouse (noun)
the luminous center of a nuclear explosion	an electrical generating station
a ball of fire (such as the sun or a ball-shaped discharge of lightning)	a team considered to be the best of its class
a highly energetic and indefatigable person	a highly energetic and indefatigable person
an especially luminous meteor (sometimes exploding)