mock orange vs shittimwood

mock orange

noun
  • Bursaria spinosa (Australian blackthorn), a small tree from Australia. 

  • Murraya paniculata (orange jessamine), a small tree ranging from East Asia to Australasia. 

  • Choisya ternata (Mexican orange), an aromatic shrub native to North America. 

  • Maclura pomifera (Osage orange), a small tree from North America. 

  • Any shrub of the genus Philadelphus, particularly Philadelphus coronarius (sweet mock orange). 

  • Pittosporum undulatum (sweet pittosporum), a small tree native to Australia. 

shittimwood

noun
  • The wood of the shittim. 

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