lilac vs plum blossom

lilac

noun
  • A flower of the lilac shrub. 

  • A pale purple color, the color of some lilac flowers. 

  • A large shrub of the genus Syringa, especially Syringa vulgaris, bearing white, pale-pink, or purple flowers. 

adj
  • Having a pale purple colour. 

plum blossom

noun
  • The blossom of the tree. 

  • A tree, Prunus mume, native to East Asia bearing an apricot-like fruit; the Japanese apricot or Chinese plum. 

  • Used other than figuratively or idiomatically: see plum, blossom. 

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