N5 - 便利べんり
useful, convenient
N5 - 郵便局ゆうびんきょく
post office
N3 - 便りたより
news, tidings, information, correspondence, letter
N3 - 郵便ゆうびん
mail, postal service
N2 - 小便しょうべん
(col) urine, piss
N2 - 便箋びんせん
writing paper, stationery
N2 - 船便ふなびん
surface mail (ship)
N2 - 便所べんじょ
toilet, lavatory, rest room, latrine, comfort station
N1 - 大便だいべん
feces, excrement, shit
N1 - 便宜べんぎ
convenience, accommodation, advantage, expedience