N4 - 役に立たつやくに立たつ
to be helpful
N3 - 役やく
use, service, role, position
N3 - 役割やくわり
part, assigning (allotment of) parts, role, duties
N2 - 重役じゅうやく
director, high executive
N2 - 主役しゅやく
leading part, leading actor (actress)
N2 - 役者やくしゃ
actor, actress
N2 - 役所やくしょ
government office, public office
N2 - 役人やくにん
government official
N1 - 役えき
war, campaign, battle
N1 - 重役おもやく
heavy responsibilities, director
N1 - 役職やくしょく
post, managerial position, official position
N1 - 役立つやくだつ
to be useful, to be helpful, to serve the purpose