mortician vs trained worker

mortician and trained worker both are nouns.

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

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

Other hypernyms of mortician include skilled worker, skilled workman.

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