rubber vs hard rubber

hard rubber vs rubber

rubber and hard rubber both are nouns.

rubber is an adjective but hard rubber is not an adjective.

rubber is a verb but hard rubber is not a verb.

Word	Noun	Adjective	Verb	Adverb
rubber	Yes	Yes	Yes	No
hard rubber	Yes	No	No	No

As nouns, hard rubber is a hyponym of rubber; that is, hard rubber is a word with a more specific, narrower meaning than rubber:

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
hard rubber: a hard nonresilient rubber formed by vulcanizing natural rubber

Other hyponyms of rubber include foam rubber, crepe rubber, cold rubber, ebonite, vulcanite, Para rubber.

rubber (noun)	hard rubber (noun)
a waterproof overshoe that protects shoes from water or snow	a hard nonresilient rubber formed by vulcanizing natural rubber
contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
an eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil
a contest consisting of a series of successive matches between the same sides
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
any of various synthetic elastic materials whose properties resemble natural rubber

rubber (adjective)	hard rubber (adjective)
returned for lack of funds

rubber (verb)	hard rubber (verb)
coat or impregnate with rubber

Difference between rubber and hard rubber

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