hard rubber vs rubber

rubber vs hard rubber

hard rubber and rubber both are nouns.

hard rubber is not an adjective while rubber is an adjective.

hard rubber is not a verb while rubber is a verb.

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

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

hard rubber: a hard nonresilient rubber formed by vulcanizing natural 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

Other hypernyms of hard rubber include caoutchouc, gum elastic, India rubber, natural rubber.

hard rubber (noun)	rubber (noun)
a hard nonresilient rubber formed by vulcanizing natural rubber	a waterproof overshoe that protects shoes from water or snow
	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

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

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

Difference between hard rubber and rubber

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