rubber vs foam rubber

foam rubber vs rubber

rubber and foam rubber both are nouns.

rubber is an adjective but foam rubber is not an adjective.

rubber is a verb but foam rubber is not a verb.

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

As nouns, foam rubber is a hyponym of rubber; that is, foam 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
foam rubber: spongy rubber; made by introducing air bubbles before vulcanization and used for cushioning or upholstery

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

rubber (noun)	foam rubber (noun)
a waterproof overshoe that protects shoes from water or snow	spongy rubber; made by introducing air bubbles before vulcanization and used for cushioning or upholstery
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)	foam rubber (adjective)
returned for lack of funds

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

Difference between rubber and foam rubber

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