human dynamo vs powerhouse

human dynamo and powerhouse both are nouns.

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

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

human dynamo and powerhouse: a highly energetic and indefatigable person

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

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