belt loop vs beltloop

belt loop

noun
  • A highway that loops around the perimeter of a major city. 

  • The 'D' shaped frame of a belt buckle 

  • One of the loops of fabric ringing the waist of a pair of pants, used to hold the belt in place. 

beltloop

How often have the words belt loop and beltloop occurred in a corpus of books? (source: Google Ngram Viewer )