interior planet

15 LETTERS · STARTS WITH I

interior planet is a valid 15-letter word worth 16 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

I1N1T1E1R1I1O1R1P3L1A1N1E1T1

1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 0 + 3 + 1 + 1 + 1 + 1 + 1 =16 PTS

DOUBLE WORD → 32TRIPLE WORD → 48

MEANING

What does interior planet mean?