位冠[ikan] ancient headgear showing rank
衣冠[ikan] kimono and ancient head-dress
栄冠[eikan] laurels
王冠[oukan] crown
加冠[kakan] crowning a boy with a traditional cap for the first time at a coming-of-age ceremony

花冠[kakan] corolla (of flower)
冠を曲げる[kanmuriwomageru] to become displeased
冠位[kani] system indicating court ranks by headgear colors (colours)
冠婚葬祭[kankonsousai] important ceremonial occasions in family relationships
冠詞[kanshi] article

家宝[kahou] heirloom
擬宝珠[giboshi] ornamental railing top
合成宝石[gouseihouseki] synthetic gems
国宝[kokuhou] national treasure
財宝[zaihou] treasure

三重宝冠[sanjuuhoukan] (papal) triple tiara
至宝[shihou] most valuable asset
七宝[shippou] the 7 treasures (gold, silver, pearls, agate, crystal, coral, lapis lazuli)
什宝[juuhou] treasured article
重宝がる[chouhougaru] to find useful