馬克[maruku] mark
克己[kokki] self denial
克己心[kokkishin] spirit of self-denial
克復[kokufuku] restoration
克服[kokufuku] conquest (problem, disease, handicap, etc. e.g. poverty, illness)

克明[kokumei] detailed
克つ[katsu] to win
打克つ[uchikatsu] to conquer (e.g. an enemy)
下克上[gekokujou] juniors dominating seniors
相克[soukoku] rivalry