skilled worker vs trained worker

skilled worker and trained worker both are nouns.

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

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

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

Other synonyms of skilled worker include skilled workman.

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