nonexchangeability

18 LETTERS · 7 SYLLABLES · STARTS WITH N

nonexchangeability is a valid 18-letter word worth 36 points in Scrabble and 41 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

N1O1N1E1X8C3H4A1N1G2E1A1B3I1L1I1T1Y4

1 + 1 + 1 + 1 + 8 + 3 + 4 + 1 + 1 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 =36 PTS

DOUBLE WORD → 72TRIPLE WORD → 108

MEANING

What does nonexchangeability mean?