frutex vs softwood

frutex

noun
  • A plant with a woody, durable stem, but less than a tree; a shrub. 

softwood

noun
  • The tree or tree species that yields this wood. 

  • Any commercial timber. 

  • The wood from any gymnosperm, without regard to how soft this wood is. 

  • Wood of this kind, but limited to those that are commercial timbers. 

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