chaparral vs underwood

chaparral

noun
  • A region of shrubs, typically dry in the summer and rainy in the winter. The coast of the Mediterranean is such a region. 

  • The foliage of creosote bush, Larrea divaricata, when used as a medicinal herb. 

underwood

noun
  • Underbrush, undergrowth. 

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