N5
けっこん
Definition
marriage
N4
たす
Definition
to add (numbers), to add (something), to top up (with something), to take care of (e.g. one's business)
N3
せいぞう
Definition
manufacture, production
N2
せいのう
Definition
ability, performance, efficiency
N1
くんしゅ
Definition
ruler, monarch, sovereign