noninterchangeableness

22 LETTERS · 7 SYLLABLES · STARTS WITH N

noninterchangeableness is a valid 22-letter word worth 30 points in Scrabble and 38 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

N1O1N1I1N1T1E1R1C3H4A1N1G2E1A1B3L1E1N1E1S1S1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 1 + 1 =30 PTS

DOUBLE WORD → 60TRIPLE WORD → 90

MEANING

What does noninterchangeableness mean?