1) Carbonise 2) Carburise 3) Carburize 4) Change state 5) To scorch or blacken 6) Turn 7) Unite with carbon 1) Carbonise 2) Carburise 3) Carburize 4) Char 
• (v. t.) To impregnate or combine with carbon, as in making steel by cementation. • (v. t.) To convert (an animal or vegetable substance) into a residue of carbon by the action of fire or some corrosive agent; to char.
Car'bon·ize transitive verb [ imperfect & past participle Carbonized ; present participle & verbal noun Carbonizing .] [ Confer French carboniser .] 1. To convert (an animal or vegetable substance) into a residue of carbon...
[v] - unite with carbon 2. [v] - turn into carbon, as by burning
carburise verb unite with carbon; `carburize metal`carbonise verb turn into carbon, as by burning; `carbonize coal`