Nouns

(n)rubber, natural rubber, India rubber, gum elastic, caoutchoucan 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
(n)rubber, synthetic rubberany of various synthetic elastic materials whose properties resemble natural rubber
(n)rubbera contest consisting of a series of successive matches between the same sides“he won three out of five games to take the rubber”
(n)rubber eraser, rubber, pencil eraseran eraser made of rubber (or of a synthetic material with properties similar to rubber); commonly mounted at one end of a pencil
(n)condom, rubber, safety, safe, prophylacticcontraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
(n)arctic, galosh, golosh, rubber, gumshoea waterproof overshoe that protects shoes from water or snow

Verbs

(v)rubberize, rubberise, rubbercoat or impregnate with rubber“rubberize fabric for rain coats”

Adjectives

(s)rubber, no-goodreturned for lack of funds“a rubber check”, “a no-good check”