N5
こたえる
Definition
to answer, to reply
N4
しばらく、しゅゆ、すゆ
Definition
little while, short while, moment, instant, a while, quite a time, it's been a long time
N3
かいぜん
Definition
betterment, improvement, kaizen (Japanese business philosophy of continuous improvement)
N2
かいつう
Definition
opening, open, taking effect, becoming active
N1
がんそう、うがい
Definition
gargling, rinsing one's mouth