powerhouse vs fireball

powerhouse and fireball both are nouns.

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

As nouns, powerhouse and fireball are synonyms defined as:

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

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