narrow-gauge vs rudimentary

narrow-gauge

adj
  • Limited or petty. 

  • Relating to narrow gauge. 

rudimentary

adj
  • Basic; minimal; with less than, or only the minimum, necessary. 

  • Of or relating to one or more rudiments. 

noun
  • One of the rudimentary mammae of boars. 

How often have the words narrow-gauge and rudimentary occurred in a corpus of books? (source: Google Ngram Viewer )