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Ebonite
A hard, black variety of vulcanite. It may be cut and polished, and is used for many small articles, as combs and buttons, and for insulating material in electric apparatus.
Hard rubber produced by vulcanizing with a large proportion of sulphur.
oewn 202368% interchangeable
Open English WordNet places these words in at least one shared synset. They share a lexicalised sense, but context, register and collocation should still be checked before substitution.