Carbon
Part of speech: noun
Definition: The chemical element (symbol C) with an atomic number of 6. A sheet of carbon paper. A carbon copy. A fossil fuel that is made of impure carbon such as coal or charcoal. Carbon dioxide, in the context of global warming and climate change.
Example sentence: Preventing global warming from becoming a planetary catastrophe may take something even more drastic than renewable energy, superefficient urban design, and global carbon taxes.
C
Part of speech: symbol
Definition: The letter cee, the third letter of the English alphabet.
Part of speech: abbreviation
Definition:
Part of speech: noun
Definition: The middle tone in either one of the sets of seven white keys on a keyboard or a set of seven strings on a stringed instrument.