Word

礼冠

らいかん、れいかん
crown or head-ornament worn with formal or ceremonial clothes by nobility (ritsuryo system)
Word

小冠者

こかんじゃ
young man (who has recently undergone his manhood ceremony)
Word

沐猴にして冠す

exp
もっこうにしてかんす
to be an incompetent leader (like a monkey wearing a crown)