bindweed vs holm oak

bindweed

noun
  • bittersweet nightshade, blue bindweed (Solanum dulcamara). 

  • true bindweed (Convolvulus). 

  • slender bindweed (Polymeria calycina). 

  • false bindweed (Calystegia). 

  • black bindweed (Fallopia convolvulus). 

holm oak

noun
  • An evergreen tree, Quercus ilex, native to the Mediterranean region. 

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