vulcanizer vs skilled workman

vulcanizer and skilled workman both are nouns.

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

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

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

Other hypernyms of vulcanizer include skilled worker, trained worker.

vulcanizer (noun)	skilled workman (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