trained worker vs skilled worker

trained worker and skilled worker both are nouns.

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

As nouns, trained worker and skilled worker are synonyms defined as:

trained worker and skilled worker: a worker who has acquired special skills

Other synonyms of trained worker include skilled workman.

trained worker (noun)	skilled worker (noun)
a worker who has acquired special skills	a worker who has acquired special skills