power worker vs skilled workman

power worker and skilled workman both are nouns.

Word	Noun	Adjective	Verb	Adverb
power worker	Yes	No	No	No
skilled workman	Yes	No	No	No

As nouns, skilled workman is a hypernym of power worker; that is, skilled workman is a word with a broader meaning than power worker:

Other hypernyms of power worker include skilled worker, trained worker.

power worker (noun)	skilled workman (noun)
a worker at a power station	a worker who has acquired special skills