The term "royalty mate" refers to someone who is closely associated with aristocracy or monarchy. However, there are plenty of other synonymic phrases or words that can replace "royalty mate" in conversation or writing. Some of these synonyms might include "nobility comrade," "aristocracy companion," or simply "monarch acquaintance." Other synonyms could be "peer friend," "blue blood ally," or "regal partner." Regardless of which synonym you choose to use, they all imply a close relationship with the upper echelons of society, and a familiarity with the customs, traditions, and culture associated with royal pedigree.