crape vs crepe rubber

crape

noun
  • Mourning garments, especially an armband or hatband. 

verb
  • To form into ringlets; to curl or crimp. 

  • To clothe in crape. 

crepe rubber

noun
  • Rubber with a crinkled texture, used for soles of shoes. 

How often have the words crape and crepe rubber occurred in a corpus of books? (source: Google Ngram Viewer )