shrub vs softwood

shrub

noun
  • A woody plant smaller than a tree, and usually with several stems from the same base. 

  • A word mispronounced by replacing some consonant sounds with others of a similar place of articulation due to interference from one's knowledge of an indigenous Kenyan language. 

  • A liquor composed of vegetable acid, fruit juice (especially lemon), sugar, sometimes vinegar, and a small amount of spirit as a preservative. Modern shrub is usually non-alcoholic, but in earlier times it was often mixed with a substantial amount of spirit such as brandy or rum, thus making it a liqueur. 

verb
  • To mispronounce a word by replacing some consonant sounds with others of a similar place of articulation due to interference from one's knowledge of an indigenous Kenyan language. 

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 shrub and softwood occurred in a corpus of books? (source: Google Ngram Viewer )