trained worker vs skilled workman

trained worker and skilled workman both are nouns.

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

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

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

Other synonyms of trained worker include skilled worker.

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