lemon vs mandarin orange

lemon

noun
  • A semitropical evergreen tree, Citrus limon, that bears such fruits. 

  • A more or less bright shade of yellow associated with lemon fruits. 

  • A defective or inadequate item or individual. 

  • A yellowish citrus fruit. 

  • Favor. 

  • A piece of fanfiction involving explicit sex. 

verb
  • To flavour with lemon. 

adj
  • Containing or having the flavour/flavor and/or scent of lemons. 

  • Of the pale yellow colour/color of lemons. 

  • Smart; cheeky, vocal. 

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 lemon and mandarin orange occurred in a corpus of books? (source: Google Ngram Viewer )