1. The state of being high; a title of honour given to princes or other men of rank.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• lighness,
• hightes,
• highner,
• roghness,
• highes,
• higness,
• highers,
• tighness,
• hightens,
• hiness,
• hieness,
• highnest,
• higiness,
• hignes,
• hingness,
• higclass,
• highclas,
• highklass,
• hiegheels,
• hignmass

• HIGGENS,
• higginson,
• higgins.

The adjective form of the word "highness" is "high".

The plural of the "highness" can be the "highnesses".

The singular of the "highness" can be the "highness".