Answer: aughts

AnswerCrossword Clue
AUGHTSSome of the 2000s?
AUGHTSPlenty of nothing
AUGHTSCipher.
AUGHTSZeros
AUGHTSZeroes
AUGHTSRound numbers
AUGHTSPeriod of George W. Bush's presidency
AUGHTSMost of 1,000
AUGHTSPeriod immediately following Y2K
aughtscipher (0); zero
aughtsanything whatever
aughtsAUGHT, a zero
aughtszero cipher