phlebotomist vs skilled worker

phlebotomist and skilled worker both are nouns.

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

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

Other hypernyms of phlebotomist include skilled workman, trained worker.

phlebotomist (noun)	skilled worker (noun)
someone who practices phlebotomy	a worker who has acquired special skills