supplementary vs suppletory

supplementary

noun

  • Something additional; an extra. 

adj

  • Additional; added to supply what is wanted. 

suppletory

noun

  • A supplement. 

  • A source of supply. 

adj

  • Making up for deficiencies; supplementary. 

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