vulcanite vs natural rubber

vulcanite and natural rubber both are nouns.

Word	Noun	Adjective	Verb	Adverb
vulcanite	Yes	No	No	No
natural rubber	Yes	No	No	No

As nouns, natural rubber is a hypernym of vulcanite; that is, natural rubber is a word with a broader meaning than vulcanite:

vulcanite: a hard nonresilient rubber formed by vulcanizing natural rubber
natural rubber: an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products

Other hypernyms of vulcanite include caoutchouc, gum elastic, India rubber, rubber.

vulcanite (noun)	natural rubber (noun)
a hard nonresilient rubber formed by vulcanizing natural rubber	an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products