skilled workman vs trained worker

skilled workman and trained worker both are nouns.

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

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

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

Other synonyms of skilled workman include skilled worker.

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