俄に[niwakani] suddenly
俄景気[niwakageiki] temporary boom
俄仕込み[niwakajikomi] hasty preparation
俄仕立て[niwakajitate] extemporary
俄成金[niwakanarikin] overnight millionaire

俄然[gazen] suddenly
俄造り[niwakazukuri] makeshift
俄分限[niwakabungen] mushroom millionaire
俄勉強[niwakabenkyou] cramming
俄盲[niwakamekura] sudden blindness