Why
How
adverb
なぜ
何故 (なぜ) Why, How
何故なら (なぜなら) Because, The Reason Is
何で (なんで、most casual、kana only、not on WK) Why, How
如何して (どうして、casual、kana only、not on WK) Why, How
何故 (なぜ、formal、kana only) Why, How
何 (なに、なん) What
故 (ゆえ) Reason, Circumstance, Cause
Why 何故? For what 何 reason 故?
Why is his Nase なぜ (nose in German) so big?