human dynamo vs actor

human dynamo and actor both are nouns.

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

As nouns, actor is a hypernym of human dynamo; that is, actor is a word with a broader meaning than human dynamo:

Other hypernyms of human dynamo include doer, worker.

human dynamo (noun)	actor (noun)
a highly energetic and indefatigable person	a theatrical performer
	a person who acts and gets things done