powerhouse vs human dynamo

powerhouse and human dynamo both are nouns.

Word	Noun	Adjective	Verb	Adverb
powerhouse	Yes	No	No	No
human dynamo	Yes	No	No	No

As nouns, powerhouse and human dynamo are synonyms defined as:

powerhouse and human dynamo: a highly energetic and indefatigable person

Other synonyms of powerhouse include ball of fire, fireball.

powerhouse (noun)	human dynamo (noun)
an electrical generating station	a highly energetic and indefatigable person
a team considered to be the best of its class
a highly energetic and indefatigable person