noun

a circular ornamental headdress worn by a monarch as a symbol of authority, usually made of or decorated with precious metals and jewels.

coronet,diadem,tiara,circlet,chaplet,fillet,wreath,garland,headband,coronal,taj

verb

ceremonially place a crown on the head of (someone) in order to invest them as a monarch.

he went to Rome to be crowned

invest,induct,install,instate,ordain,initiate,inaugurate,enthrone,swear in