reginal vs regnant

reginal

adj
  • Of, relating to, or resembling a queen. 

regnant

adj
  • of a monarch, ruling in one's one right; often contrasted with consort and dowager 

  • Reigning, ruling; currently holding power. 

  • Dominant; holding sway; having particular power or influence. 

How often have the words reginal and regnant occurred in a corpus of books? (source: Google Ngram Viewer )