armorer vs trained worker

armorer and trained worker both are nouns.

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

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

Other hypernyms of armorer include skilled worker, skilled workman.

armorer (noun)	trained worker (noun)
a manufacturer of firearms	a worker who has acquired special skills
an enlisted man responsible for the upkeep of small arms and machine guns etc.
a worker skilled in making armor or arms