Answer: tremblers

AnswerCrossword Clue
TREMBLERSQuakers.
TREMBLERSShakers
TREMBLERSTerrified ones
TREMBLERSOnes quivering
tremblersTREMBLER, one who trembles (to shake (to move to and fro with short, rapid movements))
tremblersAn earthquake
tremblersA songbird related to the thrashers, found in the Lesser Antilles and named from its habit of violent shaking