constructional vs elementary

constructional

adj
  • Of, pertaining to, or obtained by construction. 

elementary

adj
  • Relating to the basic, essential or fundamental part of something. 

  • Relating to an elementary school. 

  • Relating to a subatomic particle. 

noun
  • A supernatural being which is associated with the elements. 

  • An elementary school 

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