mortician vs skilled worker

mortician and skilled worker both are nouns.

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

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

Other hypernyms of mortician include skilled workman, trained worker.

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