auger

n tool for boring holes in wood, like a gimlet but larger 螺旋钻; 麻花钻.

auction bridge, auctioneer, audacious, audaciously, audacity, audibility, audible, audibly, audience, audio, audio frequency, audio typist, audio-, audio-visual, audit, audition, auditor, auditorium, auditory, Aug, aught, augment, augmentation, augmented, augur, augury, August, Augustan, auk, auld lang syne, aunt, Aunt Sally, auntie (also aunty), aura, aural, aurally, aureola, auricular, aurora, auspice,