favourable vs plus mark

favourable

noun

  • A favourable person 

adj

  • Pleasing, encouraging or approving. 

  • Useful or helpful. 

  • Auspicious or lucky. 

  • Convenient or at a suitable time; opportune. 

plus mark

noun

  • A plus sign. 

How often have the words favourable and plus mark occurred in a corpus of books? (source: Google Ngram Viewer )