急度[kitto] surely
オリエント急行[orientokyuukou] Orient express
応急[oukyuu] emergency
応急攻撃[oukyuukougeki] hasty attack
応急渡河[oukyuutoka] hasty crossing

火急[kakyuu] emergency
緩急[kankyuu] pace
危急[kikyuu] emergency
危急存亡[kikyuusonbou] life-and-death matter

途轍もない[totetsumonai] extravagant
転轍[tentetsu] switching or shunting (of a rail car)
転轍手[tentetsushu] switchman
転轍機[tentetsuki] switch (of a railroad)
轍叉[tessa] railway frog

前轍[zentetsu] wheel tracks left by vehicles that have passed before
轍を踏む[tetsuwofumu] to repeat a mistake (of somebody)
前車の轍を踏む[zenshanotetsuwofumu] to repeat the mistake of somebody
前轍を踏む[zentetsuwofumu] to repeat the mistake of somebody

寒鮒[kanbuna] crucian carp caught in midwinter
朝鮮鮒[chousenbuna] roundtail paradisefish (Macropodus ocellatus)
鮒侍[funazamurai] cowardly, good-for-nothing samurai from the countryside
轍鮒の急[teppunokyuu] imminent danger
轍鮒[teppu] imminent danger

鮒寿司[funazushi] funazushi
銀鮒[ginbuna] Carassius langsdorfii
金鮒[kinbuna] Carassius buergeri
源五郎鮒[gengoroubuna] Japanese crucian carp (Carassius cuvieri)