花束[hanataba] bunch of flowers
会う約束[auyakusoku] rendezvous
結束[kessoku] union
検束[kensoku] arrest
牽束[kensoku] restraint

口約束[kuchiyakusoku] verbal promise
拘束[kousoku] restriction
黒装束[kuroshouzoku] black clothes
札束[satsutaba] roll of banknotes
収束[shuusoku] convergence

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