English Theasurus that shows all the ways the English word is translated from the original Greek and Hebrew.
English Theasurus from the Hebrew and Greek Strong's Dictionary
diadem 4701 -- mitsnepheth -- {diadem}, mitre.
diadem 6797 -- tsaniyph -- {diadem}, hood, mitre.
diadem 6843 -- ts@phiyrah -- {diadem}, morning.