optician vs skilled workman

optician and skilled workman both are nouns.

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

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

Other hypernyms of optician include skilled worker, trained worker.

optician (noun)	skilled workman (noun)
a worker who makes glasses for remedying defects of vision	a worker who has acquired special skills