that which is worthless

faultfinding

find fault, nitpick

soul-searching

spot the difference (puzzle)

search / look for

疾う: quickly, swiftly

灯: electric lights / 投: pitches / 棟: buildings / 等: / 頭: heads of large animals (cows, horses)

刀: a sword, a katana; a scalpel, such as that used by a surgeon; a kind of bronze or copper money in ancient China, shaped a bit like a sword / 灯: electric light / 当: / 投: / 豆: / 党: political party

杜宇: