acorn vs holm oak

acorn

noun
  • The fruit of the oak, being an oval nut growing in a woody cup or cupule. 

  • A cone-shaped piece of wood on the point of the spindle above the vane, on the mast-head. 

  • See acorn-shell. 

  • A testicle. 

holm oak

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

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