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Carburize
To combine with carbon or a carbon compound; -- said esp. of a process for conferring a higher degree of illuminating power on combustible gases by mingling them with a vapor of volatile hydrocarbons.
To convert (an animal or vegetable substance) into a residue of carbon by the action of fire or some corrosive agent; to char.
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.