bittersweet vs mandarin orange

bittersweet

noun
  • A vine, of the genus Celastrus, having small orange fruit that open to reveal red seeds. 

  • A pinkish-orange color. Any color in between scarlet and orange. 

  • Bittersweetness. 

  • Bittersweet nightshade, Solanum dulcamara. 

  • Any variety of clam in the family Glycymerididae 

  • A variety of apple with a bittersweet taste. 

adj
  • Both bitter and sweet. 

  • Expressing contrasting emotions of pain and pleasure. 

  • Of bittersweet color. 

mandarin orange

noun
  • A small citrus tree (Citrus reticulata) with fruit resembling the orange. 

  • The fruit of this tree, smaller than an orange and oblate. In daily usage, it may include other similar citrus fruits like Citrus unshiu (satsuma or mikan) Citrus tangerina (tangerine). 

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