pneumonoultramicroscopicsilicovolcanosis.
40 letters
Definition: A disease caused by rolonged inhalation of silicone dust.
Commonly referred to as silicosis.
pneumonoultramicroscopicsilicovolcanosis
Is a medical term for black lung and is found in the dictionary.
Whereas
pneumonultramicroscopicsilicovolcanoconios - 43 letters
is a made up word which entered american dictionaries just two years ago.
there was a headline in the paper a few years ago after inverness caledonia beat celtic which still makes me lol
supercaleygoballisticcelticareatrocious