integer vs noun numeral

integer

noun
  • A number that is not a fraction; an element of the infinite and numerable set {..., -3, -2, -1, 0, 1, 2, 3, ...}. 

noun numeral

noun
  • A noun that represents a number 

How often have the words integer and noun numeral occurred in a corpus of books? (source: Google Ngram Viewer )