noninterchangeability

21 LETTERS · 8 SYLLABLES · STARTS WITH N

noninterchangeability is a valid 21-letter word worth 32 points in Scrabble and 38 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

N1O1N1I1N1T1E1R1C3H4A1N1G2E1A1B3I1L1I1T1Y4

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 2 + 1 + 1 + 3 + 1 + 1 + 1 + 1 + 4 =32 PTS

DOUBLE WORD → 64TRIPLE WORD → 96

MEANING

What does noninterchangeability mean?