demethylchlortetracycline
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dichlorodifluoromethanes (24 letters)
Overenthusiastically or Overapprehensiveness Both are 20 letters long :D
The longest word starting with E is Electroencephalographically.
Floccinaucinihilipilification is the longest word starting with F; it means the act of estimating something as worthless.
Pneumonoultramicroscopicsilicovolcanoconiosis (also happens to be the longest word in the English language)