plasterer vs skilled workman

plasterer and skilled workman both are nouns.

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

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

Other hypernyms of plasterer include skilled worker, trained worker.

plasterer (noun)	skilled workman (noun)
a worker skilled in applying plaster	a worker who has acquired special skills