zero hour

NOUN /ziroʊ_aʊr/
9 LETTERS · 2 SYLLABLES · STARTS WITH Z

zero hour is a valid 9-letter word worth 20 points in Scrabble and 20 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
Z10E1R1O1H4O1U1R1
10 + 1 + 1 + 1 + 0 + 4 + 1 + 1 + 1 =20 PTS
DOUBLE WORD → 40TRIPLE WORD → 60
MEANING

What does zero hour mean?

NOUN · 1 SENSE
1

The time set for the start of an action or operation.