何故なぜ Common Adverb English jmdict 1 adverb (fukushi) word usually written using kana alone why;how;for what reason あなたはなぜ働いているの。 How come you're still working?
何故ならばなぜならば Common conjunction English jmdict 1 conjunction word usually written using kana alone because;for;the reason why is ... その会合は延期されました。なぜならばジョンが病気だったからです。 The meeting was put off because John was sick.