reason why

10 LETTERS · STARTS WITH R

reason why is a valid 10-letter word worth 18 points in Scrabble and 17 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

R1E1A1S1O1N1W4H4Y4

1 + 1 + 1 + 1 + 1 + 1 + 0 + 4 + 4 + 4 =18 PTS

DOUBLE WORD → 36TRIPLE WORD → 54

MEANING

What does reason why mean?