power worker vs power-station worker

power worker and power-station worker both are nouns.

Word	Noun	Adjective	Verb	Adverb
power worker	Yes	No	No	No
power-station worker	Yes	No	No	No

As nouns, power worker and power-station worker are synonyms defined as:

power worker (noun)	power-station worker (noun)
a worker at a power station	a worker at a power station