Nonmetallic element (6)
(Other definitions for carbon that I've seen before include "Dioxide or monoxide, say" , "Common element" , "Charcoal is a form of this element" , "Substance" , "C (with a footprint)" .)
(Other definitions for sulphur that I've seen before include "Highly flammable yellow element" , "S (chem.)" , "Chemical element" , "Yellow non-metallic element" , "Chemical used in match heads" .)