nuptial vs spousal

nuptial

adj
  • Of or pertaining to wedding and marriage. 

  • Capable, or characteristic, of breeding. 

spousal

adj
  • of or relating to marriage 

  • of or relating to a spouse, spouses; to the relationship between spouses 

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