subalternate vs subjacent

subalternate

adj
  • Subaltern; inferior; subordinate. 

  • Succeeding by turns; successive. 

noun
  • A particular proposition, as opposed to a universal one. 

subjacent

adj
  • Lying beneath or at a lower level; underlying. 

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