N5
シャツ
Definition
shirt (underwear), undershirt, singlet, shirt (outerwear, esp. dress shirt)
N4
せんぱい
Definition
senior (at work or school), superior, elder, older graduate, progenitor, old-timer
N3
かたな、とう
Definition
(single-edged) sword, katana, dagger, knife, scalpel
N2
かぜい
Definition
taxation
N1
うんえい
Definition
management, administration, operation