Answer: highness

AnswerCrossword Clue
HIGHNESSPart of HRH
HIGHNESSRoyal title
HIGHNESSAltitude
HIGHNESSElizabeth II's title of honor.
HIGHNESSRoyal title.
highnessthe state of being high (reaching far upward)
highnessA title given to a person of royal rank, or used in addressing them
highnessThe state of being high