vulcanizer vs skilled worker

vulcanizer and skilled worker both are nouns.

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

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

vulcanizer: someone who vulcanizes rubber to improve its strength and resiliency
skilled worker: a worker who has acquired special skills

Other hypernyms of vulcanizer include skilled workman, trained worker.

vulcanizer (noun)	skilled worker (noun)
a device used for the vulcanization of rubber.	a worker who has acquired special skills
someone who vulcanizes rubber to improve its strength and resiliency