The term 'Highness' can be broken down into four crossword solutions: HEIGHT (6 letters), EMINENCE (8 letters), SIRE (4 letters), and HER (3 letters). HEIGHT is a measurement of the vertical distance from the base of an object to its topmost point. EMINENCE is a term used to describe someone who is respected and admired for their achievements or qualities. SIRE is an archaic term used to refer to a male ruler or monarch. Finally, HER is a pronoun used to refer to a female. All of these terms are related to the concept of Highness, which is a title given to a person of high rank, such as a monarch or other noble.