cardinal number vs grammatical number

cardinal number

noun
  • A word that expresses a countable quantity; a cardinal numeral. 

  • A generalized kind of number used to denote the size of a set, including infinite sets. 

  • A number used to denote quantity; a counting number; a cardinal. 

grammatical number

noun
  • the feature of words distinguishing quantities 

How often have the words cardinal number and grammatical number occurred in a corpus of books? (source: Google Ngram Viewer )