bitter orange vs sweet lime

bitter orange

noun

  • A citrus tree of the species Citrus limetta. 

  • The fruit of these species. 

  • A citrus tree of the species Citrus ×aurantium, also called Citrus aurantium. 

sweet lime

noun

  • sweet lemon 

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