殉教者[junkyousha] martyr
殉国[junkoku] dying for one's country
殉死[junshi] dying a martyr
殉職[junshoku] dying at one's post
殉難[junnan] martyrdom

殉教[junkyou] martyrdom
殉難者[junnansha] victim
殉職者[junshokusha] person who has died at his post (in the performance of his duties)
殉じる[junjiru] to sacrifice oneself