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

ゴミ集積場[gomishuusekijou] village garbage collection point
欝積[usseki] accumulation (e.g. of emotions, grievances, etc.)
沖積[chuuseki] alluvial
沖積期[chuusekiki] alluvial period
沖積世[chuusekisei] alluvial epoch (i.e. the Holocene epoch)

沖積層[chuusekisou] alluvium
沖積土[chuusekido] alluvial soil
下積み[shitazumi] lowest social strata
求積[kyuuseki] mensuration
経路積分[keirosekibun] path integral (physics)