15 letter word
The only 15 letter word that can be spelled without repeating a letter is uncopyrightable.
More Language Facts
The sentence: "The quick brown fox jumps over the lazy dog" uses every letter of the alphabet.
"Dreamt" is the only English word that ends in the letters "mt".
There are only four words in the English language which end in "dous": tremendous, horrendous, stupendous and hazardous.