refiner vs skilled workman

refiner and skilled workman both are nouns.

Word	Noun	Adjective	Verb	Adverb
refiner	Yes	No	No	No
skilled workman	Yes	No	No	No

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

Other hypernyms of refiner include skilled worker, trained worker.

refiner (noun)	skilled workman (noun)
one whose work is to refine a specific thing	a worker who has acquired special skills