惣菜[souzai] side dish
惣領[souryou] eldest child
惣社[souja] shrine enshrining several gods
惣嫁[souka] (Edo period) streetwalker

惣管領[soukanryou] (hist.) governor-general
助惣鱈[sukesoudara] walleye pollack
惣構[sougamae] outermost enclosure of a castle or fortress (including the town around it)
惣菜店[souzaiten] delicatessen

ご多忙中[gotabouchuu] in the midst of your work (often used as a formal phrase in business letters, etc.)
多忙[tabou] busy
忙がしい[sewashii] busy
繁忙[hanbou] pressure of business
忙殺[bousatsu] being extremely busy

忙しげ[sewashige] looking busy
気忙しい[kizewashii] restless
忙中[bouchuu] (in the midst of) busyness
心忙しい[kokorozewashii] restless
仕事で忙しい[shigotodeisogashii] busy with one's work

烏兎匆匆[utosousou] days and nights passing by quickly

匆匆[sousou] busy