生贄[ikenie] sacrifice
鵙の速贄[mozunohayanie] butcher-bird prey impaled on twigs, thorns, etc. for later consumption

速贄[hayanie] butcher-bird prey impaled on twigs, thorns, etc. for later consumption

逸速く[ichihayaku] promptly
音速[onsoku] speed of sound
加速[kasoku] acceleration
加速運動[kasokuundou] accelerated motion
加速度[kasokudo] acceleration

快速[kaisoku] high speed
快速電車[kaisokudensha] high-speed train
角速度[kakusokudo] angular velocity
急速[kyuusoku] rapid (e.g. progress)
減速[gensoku] deceleration