tranquilizer

NOUN /træŋkwə,laɪzər/
12 LETTERS · 4 SYLLABLES · STARTS WITH T

tranquilizer is a valid 12-letter word worth 30 points in Scrabble and 33 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
T1R1A1N1Q10U1I1L1I1Z10E1R1
1 + 1 + 1 + 1 + 10 + 1 + 1 + 1 + 1 + 10 + 1 + 1 =30 PTS
DOUBLE WORD → 60TRIPLE WORD → 90
MEANING

What does tranquilizer mean?