mortician vs skilled workman

mortician and skilled workman both are nouns.

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

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

Other hypernyms of mortician include skilled worker, trained worker.

mortician (noun)	skilled workman (noun)
one whose business is the management of funerals	a worker who has acquired special skills