OK, I just made up the word lexicoid – it’s a piece of trivial information about words: lexicon + factoid = lexicoid.
Anyway, here goes:
The longest [15 letters] two words that can be spelled without repeating a letter are [drumroll, please] . . .
uncopyrightable and dermatoglyphics.
Dermatoglyphics, incidentally, is the study of the patterns of ridges of skin on the fingers & palms, and on the bottoms of the feet.
So, what you discover via dermatoglyphics is unique, but probably uncopyrightable. Go figure.
Image via pretty knitty jewelry.