serviceman vs skilled worker

serviceman and skilled worker both are nouns.

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

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

serviceman: someone who serves in the armed forces; a member of a military force
skilled worker: a worker who has acquired special skills

Other hypernyms of serviceman include skilled workman, trained worker.

serviceman (noun)	skilled worker (noun)
someone who serves in the armed forces; a member of a military force	a worker who has acquired special skills