ground observer

15 LETTERS · STARTS WITH G

ground observer is a valid 15-letter word worth 21 points in Scrabble and 26 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

G2R1O1U1N1D2O1B3S1E1R1V4E1R1

2 + 1 + 1 + 1 + 1 + 2 + 0 + 1 + 3 + 1 + 1 + 1 + 4 + 1 + 1 =21 PTS

DOUBLE WORD → 42TRIPLE WORD → 63

MEANING

What does ground observer mean?