position isomer

15 LETTERS · STARTS WITH P

position isomer is a valid 15-letter word worth 18 points in Scrabble and 21 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
P3O1S1I1T1I1O1N1I1S1O1M3E1R1
3 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 1 + 3 + 1 + 1 =18 PTS
DOUBLE WORD → 36TRIPLE WORD → 54
MEANING

What does position isomer mean?

1