vulcanizer vs trained worker

vulcanizer and trained worker both are nouns.

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

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

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

Other hypernyms of vulcanizer include skilled worker, skilled workman.

vulcanizer (noun)	trained 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